Senku Ishigami/Synopsis

The story of Senku Ishigami from Dr. Stone.
==Biography==
===Early Childhood===
Not much is known about Senku's childhood other than the fact that, ever since he was able to walk, he had a knack for science, likely an interest he acquired from his adoptive father Byakuya. When he was young, Senku also met a young boy named Taniju Oki and became close friends with him. In spite of their conflicting personalities and different levels of intelligence, Senku found him enduring and enjoyed his company, mostly because of their contrasting personalities. Senku had the brains and Taniju had the brawns. However, Senku would occasionally use Taniju's lack of intelligence against him, often pulling pranks on him in front of their peers, in light-hearted fun. 
===Petrification Event===
On June 3rd, 2019, a strange event occurred where a greenish light swept across the Earth, turning all humans into stone statues. When this light touched a person, their skin began to harden like stone, rendering them immobile. The light's progression was rapid, unaffected by obstacles like walls or shadows. Remarkably, the six members of the International Space Station (ISS) crew remained unaffected, as they orbited above the Earth. Byakuya, a member of the ISS crew, estimated the event's epicenter to be somewhere in South America based on their view from space and the last online updates worldwide. Senku deduced from Why-man's radio signal that they were replicating the massive petrification event of 2019, with an assumed diameter of 12,800,000 meters, slightly larger than Earth's diameter.
Senku's first appearance is when Taiju reveals his intention to confess his feelings to Yuzuriha. Senku offers Taiju a supposed "potion" that he claims would guarantee a ten billion percent success rate. However, Taiju declines, preferring to confess genuinely and await Yuzuriha's true response. Senku later discloses to another classmate that the potion was, in fact, composed of gasoline and would have been fatal if consumed. Senku, however, had complete certainty that Taiju would reject it. As their classmates start betting on how Yuzuriha will respond to Taiju's confession, with most believing she will reject him, Senku places a ten thousand yen wager on Yuzuriha having feelings for Taiju as well. Shortly thereafter, the mysterious Petrification event occurs, turning Senku and everyone else into stone statues.
While trapped in his petrified state, Senku remained conscious and meticulously counted the duration of his petrification. He also devised a way to keep track of the changing seasons, hoping for a possible revival before winter set in. Eventually, by some stroke of fate, his stone statue ended up within a cave, where moisture droplets played a role in freeing him from his stony confinement. Upon his revival, Senku had tallied a staggering 117,354,893,870 seconds, signifying that he had endured 3,719 years and 249 days of petrification. It was on April 1, 5738, known as Stone Day, when Senku emerged from his stony prison, and he made sure to mark this significant day on a tree outside the cave.
===Stone Formula Arc===
After breaking free from his petrified state, Senku embarks on a mission to ensure his survival in this new world. He starts by crafting clothing and a basic shelter for himself. However, he soon realizes that he needs assistance for his ambitious endeavors. Fortuitously, he stumbles upon the petrified figure of Taiju and makes it his mission to find a way to reverse the petrification of people. Senku contemplates the possible causes of this event, considering scenarios like an alien invasion, human error, or a new viral strain. Despite its fantastical nature, Senku believes there must be a logical explanation behind the petrification.
Senku delves into the mechanics of the revival process, pondering whether his body shifted into a cellular form during petrification. He notes that only the surface of the statues degrades into a stone shell while the rest remains intact. This leads him to experiment with nitric acid, believing it may hold the key to depetrification. Unfortunately, these initial tests prove unsuccessful. Senku's determination to solve this mystery is fueled by the realization that his brain remained active for over 3,700 years during petrification, implying a source of energy within the stone. He theorizes that ethanol, found in alcohol, could react with nitric acid to create nital, potentially aiding in depetrification. However, lacking access to alcohol, he faces a dead end.
Anticipating Taiju's revival, Senku carves a message on a tree near Yuzuriha, hoping to reunite with his friend. Eventually, Taiju does indeed awaken and joins Senku. Together, they form a formidable team, with Senku's scientific acumen and Taiju's physical strength. Their collaboration leads to the discovery of the Revival Fluid, a breakthrough in depetrification. With this newfound knowledge, they set their sights on reviving others, starting with Yuzuriha, who Taiju suggests should be their first candidate.
===Vs. Tsukasa Arc===
After their attempt to depetrify Yuzuriha is interrupted by a lion attack, they are compelled to free Tsukasa, renowned as the strongest high-schooler, from his petrified state. Tsukasa swiftly grasps the situation and demonstrates remarkable strength by defeating the lion leader with a single punch. Once they escape danger and run out of the depetrification solution, they return to their hideout with a petrified Yuzuriha. At this point, Senku shares his vision of reviving humanity to its modern state, explaining the four uses of calcium carbonate found in seashells. However, Tsukasa begins to express his displeasure with Senku's plan, leading Senku to withhold one of its uses, keeping only agriculture, architecture, and medicine.
As they set out to collect seashells, Senku becomes increasingly aware of Tsukasa's desire to maintain the primitive world. Tsukasa's actions, such as destroying petrified statues of elderly individuals, raise suspicions that he might betray them. In a strategic move, Senku sends Tsukasa to obtain more nitric acid, buying them time to decide their course of action. While Tsukasa is away, Senku instructs Taiju to depetrify Yuzuriha using the nital solution he procures. Senku presents two choices: stand and confront Tsukasa or flee. However, Tsukasa reappears, determined to preserve a primitive society where everything remains freely accessible. He attacks Senku and his companions in an effort to force their surrender but ultimately retreats, unaware of the depetrification formula.
Senku devises a plan to defeat Tsukasa, revealing the fourth use of calcium carbonate: gunpowder. They set off to create gunpowder by obtaining sulfur and combining it with charcoal and saltpeter. As they test their invention, Tsukasa catches on to their ploy and pursues them. During their confrontation, a smoke signal from unknown humans is spotted. Tsukasa captures Yuzuriha, offering her in exchange for the depetrification formula. Senku agrees but makes it clear he won't abandon his quest to advance humanity. Tsukasa acknowledges this and, with regret, fatally injures Senku.
As Taiju and Yuzuriha attempt to rescue Senku, an explosion created with gunpowder allows them to escape with him. Tsukasa decides not to pursue them, believing Senku cannot recover in the Stone World. Upon closer examination, they discover that part of Senku's neck is still petrified, potentially saving him from Tsukasa's fatal blow. They apply the depetrification formula to his neck, reviving Senku. He then urges Taiju and Yuzuriha to return to Tsukasa's empire as spies, while he embarks on building his Kingdom of Science to confront Tsukasa. Thus, they part ways as Senku takes on this new challenge.
===Kingdom of Science Arc===
During his journey, Senku encounters Kohaku, the person who ignited the smoke signals. She is trapped beneath a fallen tree due to an earlier confrontation with Tsukasa. Senku aids her by using pulleys to lift the tree, for which she expresses her gratitude. Kohaku even confesses her liking for Senku, though she clarifies it's a platonic fondness. She commends Senku for his bravery in sacrificing himself to save Yuzuriha.
Kohaku invites Senku to her village, fascinated by his scientific knowledge, which she refers to as "sorcery." Upon arriving at the village, Senku faces suspicion from Kinro and Ginro, who suspect him of being an exile. After astonishing them with a display of "sorcery" involving soap bubbles, Senku confronts Chrome, the village's self-proclaimed "sorcerer." Chrome challenges Senku to a sorcery battle, with the stakes being his entire life's work and himself against Senku leaving the village forever. Senku triumphs over Chrome.
After assessing Chrome's resources, Senku decides to make a golden spear for Kinro using melted mercury mixed with gold dust. Although this gesture doesn't win Kinro over, it convinces Ginro, who desires a silver spear to match his name. Senku informs Chrome that what he considers sorcery is, in fact, science, making Chrome the first scientist in 3,700 years. Kohaku reveals that her sister, Ruri, is ill, and Chrome has been trying to find a cure. Senku proposes the use of antibiotics as a potential remedy and pledges to create one. The villagers agree to produce antibiotics, opting for the sulfur route due to its abundance in the era.
While gathering ingredients for antibiotics, Chrome points out that the Earth is spinning. Senku notices that the North Star has shifted due to Earth's tilt over 3,700 years, thanks to Chrome's magnetic rocks that act as compasses. They decide to use magnets to extract iron from the river, marking the return of the Iron Age. During this process, they encounter Suika, who was secretly helping. Senku assures Suika that her contribution is valuable and welcomes her to the Kingdom of Science. Chrome refers to Suika as "Momotaro," a story from their past told by Ruri, the village's priestess. Senku's interest in Ruri is piqued, and Chrome reveals his affection for her.
With enough iron, Senku prepares to build a furnace to melt it. However, they lack the manpower. Senku sends Suika to gather information from the villagers to persuade them to help. Learning that better food can win their support, Senku decides to make ramen. The plan succeeds, drawing villagers to help. Gen Asagiri, a modern-day mentalist working for Tsukasa, interrupts their cooking session. Tsukasa sent him to verify Senku's death, but Gen has second thoughts upon witnessing Senku's scientific achievements. Senku promises to restore electricity, sparking Gen's interest and leading him to lie to Tsukasa about Senku's death.
Magma mistakenly believes he has killed Senku and aims to become the village's chief and marry Ruri. Senku learns about the village's chief selection tournament, with Ruri, the priestess, now required to marry the winner. Magma only desires power and plans to let Ruri die after becoming chief. Senku entrusts Kohaku with the task of defeating Magma, while he and Chrome focus on creating antibiotics. Senku faces challenges, including the creation of specialized glassware for producing antibiotics. To master glassmaking, they seek the help of Kaseki, the village craftsman. Kaseki initially refuses but is swayed by Senku's determination.
The next task involves obtaining sulfuric acid from Emerald Lake, which produces deadly gases. Senku and Chrome, equipped with masks and spear detectors, embark on this perilous mission. Despite hazards and mask damage, they successfully acquire the acid. Senku continues to advance scientific knowledge in the Stone World. Suika is revealed to be nearsighted, and Senku crafts glasses for her, helping to correct her vision. Kinro is also nearsighted but refuses help due to pride. Senku realizes the importance of teamwork in glass production, and they enlist Kaseki's assistance. Ginro and Kinro request silver and gold spears, and Senku obliges, using them for a surprising purpose. Senku emphasizes the significance of collaboration between the two remaining scientists in the world. Senku's team procures essential resources and begins making antibiotics, a crucial step in their quest to revive civilization.
===Village Games Arc===
To produce antibiotics, Senku's group needs alcohol, which they plan to obtain by winning the village tournament. Senku, Chrome, Ginro, and Kohaku decide to participate to increase their chances. Their strategy is to weaken Magma, who is set to fight Kinro, thereby improving Kinro's odds. However, Kinro and Magma end up paired for the first match. During the fight, Mantle attempts to interfere but is stopped by Senku. Senku is forced to dispose of his weapons and poisons he intended to use against the combatants. Before the second round begins, Kohaku leaves briefly to rescue Suika, and upon her return, Magma manipulates Mantle into surrendering, disqualifying Kohaku. This results in Senku winning by default.
The next match is between Senku and Ginro. Senku's plan, aimed at ensuring Chrome's victory, has worked. However, with Ruri declaring she will dedicate her life to the winner, Ginro betrays Senku and fights to win and become the chief. Annoyed by Ginro's intentions and betrayal, Senku uses Suika's helmet as leverage to incapacitate Ginro, securing his victory. With only Senku and Chrome remaining, Senku intends to surrender for Chrome's benefit. To his surprise, Chrome falls unconscious during the match, leading to Senku's victory. He reluctantly marries Ruri and accepts the prize of alcohol.
Senku proceeds to work on the 25-step process to create antibiotics with the help of the villagers, including Asagiri, who is coerced by Kaseki. With everyone's assistance, Senku successfully produces the antibiotics. Asagiri receives a promised cola. Senku administers the antibiotics to Ruri, but instead of improving her condition, her health deteriorates, earning Senku the village chief's ire. However, Senku sees this as a positive development, as her symptoms help diagnose pneumonia. He suggests using sulfa drugs to treat the illness, which Ruri's father initially opposes. The villagers, including Chrome, Kohaku, Kaseki, Ginro, and Kinro, support Senku's decision, leading Ruri's father to relent. Senku successfully cures Ruri's pneumonia.
===Village Origins Arc===
Senku administers the Sulfa drug to Ruri and closely examines her lungs. He also performs an autopsy on a mouse to confirm that Ruri's ailment is indeed a bacterial infection. Suika calls their attention back to Ruri, who appears to have worsened. Kokuyo, seemingly agitated, attempts to strangle Senku. However, Senku explains that this reaction is a sign that the drug is working as intended and that Ruri can be cured. Eventually, Ruri recovers thanks to the treatment, and Senku is formally recognized as the chief of the village. To his surprise, he discovers that he shares a name with the village itself.
Ruri approaches Senku and reveals that she has learned the story of Senku and his father Byakuya from her mother, the former priestess. This revelation dawns on Senku that everyone in Ishigami Village is a descendant of his adoptive father, who avoided petrification because he was in space. Ruri proceeds to recite the 100th tale titled "Senku Ishigami," narrating Senku's upbringing and Byakuya's experiences with the other astronauts before and after the petrification event.
Kohaku realizes the implications, suggesting that everyone in the village is related to Senku. However, Senku clarifies that Byakuya isn't his biological father, and they are also separated by hundreds of generations. During the subsequent celebration, Ruri takes Senku aside to share the final part of the story, meant for his ears alone. It contains Byakuya's last wish for Senku. They visit the village graveyard, and Ruri leaves Senku to mourn the loss of his father.
===Vs. Hyoga Arc===
Gen informs the group that a warrior named Hyoga is approaching with a war party. In response, Senku devises a plan and teams up with Magma and Gen to bluff about possessing guns, successfully scaring off Hyoga's men. Hyoga, however, learns that Senku is still alive and conveys this information, mentioning that Tsukasa will be interested to hear the news.
Senku recognizes that Hyoga and his forces will likely return during a rainstorm when their gunpowder would be rendered useless. Therefore, he works tirelessly to improve the Kingdom of Science's chances before that happens. This involves crafting new glasses for Kinro and Suika, assembling the entire town to create katanas, and even making a small knife that Gen uses to sabotage Hyoga's spear.
When Suika bravely offers herself as bait to protect the village, she ends up in danger from poison gas. Kohaku and Senku come to her rescue, using the gas masks they had previously made to save her from the toxic fumes.
===Communications Arc===
Senku informs the villagers that creating the revival formula is relatively straightforward, but they lack a crucial ingredient: nitric acid, which is also needed for making gunpowder. This presents a problem because Tsukasa will eventually realize that their bluff about possessing guns won't work without nitric acid. Gen confirms that the enemy's army is growing, making their need for gunpowder even more pressing. Kohaku suggests a preemptive strike, which Senku agrees with. However, Senku has a grander plan in mind – he intends to create the most powerful weapon in history, a cellphone.
Senku explains that by harnessing communication technology, they can use espionage to gather information about the opposing army and share vital information among themselves, potentially reducing casualties to zero and securing victory in the impending war. He reveals that Taiju and Yuzuriha, who have been inside Tsukasa's empire for a long time, could be potential double agents.
To make a cellphone, Senku begins by crafting a cotton candy machine, which will serve as the basis for creating fine gold wires needed for the device. They use centrifugal force to create these wires, a concept similar to the cotton candy machine. However, before using the valuable gold, they decide to test the concept with cotton candy to ensure it works. To obtain rock sugar for the next step, Senku boils hardened sake from a fire started by Homura. Gen jokingly thanks her for starting the fire. Senku also provides Homura with sweets to potentially win her over as a spy.
Senku warns the villagers about the approaching threat from Tsukasa's forces, emphasizing the need to create a cellphone by spring. He scolds Ginro for improperly operating the cotton candy machine, highlighting the importance of precision in their scientific endeavors. Senku and his team continue their work, creating a waterwheel as an automated power source, marking the end of an era of manual labor. They then proceed to build batteries to store electricity. Senku realizes they need more batteries to complete the cellphone project.
As they face challenges in crafting the cellphone, including issues with the light bulb, Senku remains determined. He encourages Chrome to think independently and come up with solutions. They eventually solve the problem by creating a vacuum inside the light bulb, preventing the wire from burning out. With light bulbs and batteries in hand, Senku decides it's time to explore the caves they previously visited. Their next objective is to create a vacuum tube, a precursor to the computer, which will be the heart of the cellphone.
To craft the vacuum tube, they encounter challenges and setbacks, including issues with materials and precision. Chrome's enthusiasm for their projects shines through, and he suggests exploring a cave where they find a rare and valuable resource: tungsten. Despite the dangers of cave exploration and concerns about Magma's presence, Senku and his team manage to extract tungsten, a crucial material for their project. Senku expresses gratitude for Magma's strength and contributions.
As they work on creating the cellphone's body and components, Senku assigns different tasks to villagers and explains the importance of each element. The group celebrates the completion of the cellphone's body, but Senku reminds them that they need a second part to make it functional. Senku proceeds to create a microphone for the cellphone, using innovative methods with grilled seaweed and wine residue. However, he emphasizes that they still need another body to make the cellphone operational as a communication device.
Ruri's reference to a story about a bee talking to the dead leads Senku to discover a time capsule that contains a message from Byakuya, one of the astronauts from the petrification event. They play the record and share the emotional message with the villagers. Gen secretly approaches Senku with an intriguing offer, sparking curiosity about their conversation. Using the cellphone, Senku contacts Taiju and Yuzuriha, reuniting with his friends after a year apart. Senku brokers a ceasefire with Tsukasa in exchange for depetrifying his sister, Mirai, hoping it will cure her brain damage, which it does. Senku and Tsukasa team up to defeat Hyoga, but Tsukasa is cryofrozen due to his injuries.
===Age of Exploration Arc===
Senku revives Ryusui and embarks on a quest to find oil, a critical resource in their scientific endeavors. He also creates a camera, and in a significant moment, Senku becomes the subject of the first photograph taken in the Stone World. Senku's expertise is officially acknowledged as he is recognized as one of the Kingdom of Science's Five Wise Generals, a testament to his scientific leadership. The Kingdom of Science successfully reconstructs a motorboat, marking another scientific milestone. While preparing to use it, Senku has a conversation with Taiju, who inquires about the "love potion" from earlier. Senku playfully reveals that it was actually gasoline, highlighting their progress in rediscovering technologies from the pre-petrification era.
During a test run of the motorboat, the group unexpectedly receives a transmission from an unidentified individual. After a year of dedicated work, Senku and the Kingdom of Science successfully build the Perseus, a significant achievement in their quest to advance technology in the Stone World.
===Treasure Island Arc===
Senku's quest for scientific knowledge leads him to ask Ruri to recount the 100 tales, with a specific focus on minerals. He believes that valuable scientific materials may be hidden within the Soyuz capsule on Treasure Island. After showcasing the Perseus' design, Senku creates seasickness medicine to help those affected. A small team consisting of Senku, Gen, Kohaku, and Soyuz is formed to locate the capsule. During their search, Gen informs them that everyone aboard the Perseus has been petrified. They decide to head inland and use forensic science to track a young woman who may possess information about the capsule's whereabouts. However, their mission is interrupted by a riot in Amaryllis's village, prompting Senku to intervene using tear gas. Amaryllis seeks Senku's assistance in infiltrating the master's harem and defeating him.
Senku recognizes the rules governing petrification as a scientific opportunity and agrees to help Amaryllis. To improve their chances of gaining access to the harem, Senku plans to utilize the lab. They return to the captured Perseus and encounter Kirisame. A comical ruse involving Kohaku pretending to be Senku's possessive girlfriend, "Lab," wards off Kirisame. With the lab safely delivered, Senku and Amaryllis embark on a makeover project for Kohaku, with the other men also receiving makeovers. During the harem selection process, Senku creates a discreet one-way crystal radio in the form of an earring to communicate with Kohaku. He then outlines their infiltration plan, including the construction of a drone.
To test the drone's motors, Senku sends a small vehicle to Kohaku, who returns it with a message indicating their discovery of platinum. Senku provides Kohaku with a plaster-based silent bomb to aid in breaking through the concrete surrounding the precious metal. He commends his father's dedication to collecting the platinum over millennia. Using the platinum, Senku begins producing nitric acid once more. Their next mission is to revive Kaseki to assist in building the drone. With the help of diving equipment, Soyuz and Ryusui attempt to locate their petrified friends underwater but fail. Senku creates the necessary equipment, allowing them to retrieve the statues and revive Kaseki.
Senku and the group learn from Amaryllis that there is only one Petrification Weapon, and the leader of the Petrification Kingdom is a petrified statue. Senku prepares for a confrontation with the Petrification Kingdom and even crafts a pistol as a precaution. The completion of the drone marks the beginning of the battle. During the battle, Senku notices a deception by Kirisame and orders a retreat. They engage in a pursuit around the island until Ibara uses the petrification weapon. Senku narrowly avoids petrification by using revival fluid, then faces Ibara in a scientific duel, ultimately defeating him with Ryusui's assistance.
Senku sets about reviving everyone and repairing the damaged Perseus. They receive a mysterious message from Why-man, spoken in Senku's voice, containing the coordinates "12,800,000 meters, 1 second."
Category:Synopsis