DS Timeline

# Heian (794-1185)

* Around 900s: Muzan is born into what would be the future Ubuyashiki Clan, likely in the Heian capital (modern day Kyoto)
* A doctor who lived around Mt. Kumotori in the Kanto region (modern day Tokyo area) uses the blue spider lilies that grow there to try to create a medicine to treat Muzan. Thinking the medicine isn’t working, kills the doctor partway through treatment.
* Five of Muzan's wives commit suicide due to his harsh tongue
* The Ubuyashiki clan’s children keep getting ill. They are told their family carries a curse for Muzan having come from their bloodline, they swear to eliminate Muzan, and create the Demon Slayer Corps.

## Genpei War (1180-1185)

* The war sweeps Kyoto and many other parts of Japan into violence, over the centuries thereafter the seat of power switches from Kyoto to Kanto. Muzan has moved to Kanto.
* Swordsman in the Corps do not yet use Breaths and fight in whatever method they can, at some point they began using Nichirin blades because the ore soaks the sunlight. While their sword forms are already in reference to the basic Breath forms we’d know later, they are not yet using Breath techniques. The Hashira system is already in place.
* Rengoku family already practices Kankagari, hence the hair color.

# Muromachi (1336-1573)

## Ōei (1394–1428)

* Tamayo was born, 500 years before the Taisho era.
* At 19 years old, Tamayo falls ill with a life-threatening disease. Encounters Muzan who turns her into a demon, kills her husband, children and a number of other innocent lives in town.

## Sengoku period (1467-1615)

### Early 1460s

* Early 1460s: Twins Yoriichi and Michikatsu are born around Onin War (1467-1477) to the Tsugikuni Clan.
* Michikatsu brings Yoriichi a flute
* Akeno gives Yoriichi hanafuda earrings at 7 years old, talks for the first time, watches Michikatsu fight, one shot at father's retainer
* At 8 years old, mother Akeno dies at 24 years, Yoriichi leaves home. Father goes to temple. Yoriichi encounters Uta.
* At 18 years old, Yoriichi and Uta wed and settle on Mt. Kumotori.
* Around this time, Michikatsu is also wed.
* Father dies at age 35.
* When Uta is soon to give birth, she is killed by a demon and when Yoriichi finds her, he stays by her corpse for about 10 days. He is found by a Rengoku ancestor, buries Uta and joins the Demon Slayer Corps.
* Yoriichi begins teaching Breath techniques to other Corps members, their demon fighting abilities rapidly get stronger. He gets along very well with the Hashira, who improve their swordsmanship rapidly. They cannot quite manage Sun Breathing, so he modifies the breathing style to suit the swordsmen, creating five basic off-shoots: Rock, Water, Wind, Thunder, and Flame. Rengoku ancestor keeps many records of this time which are handed down throughout his family.
* Yoriichi rescues Michikatsu from a demon. Michikatsu is so taken by Yoriichi’s Sun Breathing that he abandons his family to enter the Corps and dedicate himself to learning that technique. He does not pick it up, but develops Moon Breathing. He attains a mark like Yoriichi’s, and many other slayers have attained marks as well. Michikatsu is concerned about being the best and passing on his legacy, Yoriichi still doesn’t care about these things.

### Early 1480

* Early 1480's: The young Kamado newlyweds, Sumiyoshi and Suyako, come across Yoriichi’s empty former home on Mt. Kumotori
* Mid-1480s or two years after Yoriichi saves the Kamado family: Those with marks begin to die off by the age of 25. Michikatsu is distraught, and Muzan approaches him, declaring that he is curious about what will happen if he makes a demon out of a Breath user, and giving him the choice to live on forever or die early because of his mark. Michikatsu choses to become a demon, and he maintains a loyal and open relationship under Muzan ever since.
* Michikatsu brings him the head of Oyakata-sama. The Corp henceforth enacts much stricter secrecy, and this is also around the time Kakushi are organized.
* Yoriichi encounters Muzan, Muzan declares he no longer has any interest in Breath users (after all, he didn’t master the sun, dang it). Yoriichi feels he was born to defeat this man, delivers a stunning display of Sun Breathing, but the little pieces of Muzan that get away altogether form roughly the size of a head. Tamayo is freed from Muzan’s curse and tells Yoriichi as much as she can about Muzan, including that he probably won’t appear again in Yoriichi’s life. Yoriichi lets her go.
* Yoriichi is then informed by Corp members (including Rengoku) that Michikatsu has become a demon. In addition to Yoriichi failing to kill Muzan and letting Tamayo go, makes some Corp members demand Yoriichi’s suicide to atone, but the 6-year-old Oyakata-sama (whose father is killed by Michikatsu) puts a stop to this. Yoriichi is exiled from the Corp and told to kill his brother. Some members of the Corp (in particular, Rengoku) stay in touch with Yoriichi with Oyakata-sama’s tacit permission.
* Muzan lays low for a while.
* (Spring) After being kicked out of the Corp, Yoriichi goes back to his house at Mt. Kumotori. The young Kamado couple (including a very pregnant Suyako) is attacked by a demon, but Yoriichi rescues them. Yoriichi is also the one who fetches a midwife (extremely quickly) for Suyako to give birth to Sumire. Shortly after Sumire is born the following day (in early spring), Sumiyoshi already insists that he’ll tell future generations about Yoriichi, but Yoriichi sternly tells Sumiyoshi that he hasn’t been able to save anyone, and not to see him as any kind of special person, and leaves.
* 2 years later, Yoriichi visits Sumiyoshi one fall, wanting to tell someone about his life. After sharing his story, he receives flowers from Sumire, and at Suyako’s request, he performs Sun Breathing. Sumiyoshi memorizes it by watching, and promises to pass it down. Yoriichi leaves him with the earrings his mother Akeno gave him, and keeps the toy flute from Michikatsu and a scrap of Uta’s kimono.

### 1545

* 1545-ish: Over 80 years, Yoriichi finally finds Michikatsu/Kokushibo. Yoriichi barely fails to kill him and Breaths his last. Kokushibo cut the flute in half when cutting Yoriichi’s standing corpse, but keeps the pieces with him.
* After Yoriichi’s death, Muzan goes on the offense again, eliminating anyone with knowledge of Yoriichi’s Sun Breathing techniques. The Corps is essentially erased for a time, and thereafter, they no longer find themselves as strong as they were in Yoriichi’s time. According the Rengoku records, this is because there was never any teacher as good as Yoriichi after that.

# Edo (1603-1867)

* Over two hundred years pass of Muzan trying to find the blue spider lilies or create a demon that can master the sun, and swordsman polishing their Breathing techniques as they slay demons. By this time we can assume most of Muzan’s activity is based around the Kanto area in the bustling Edo period.
* Around the later decades of the Edo period, Muzan gets the idea to make the Twelve Moon Demons with a large amount of his blood. Hantengu might be the first, then Akaza any time between 1785 and 1800,
* Douma’s formation was after this
* Gyutaro’s still later
* All of the Upper Moons were in place by no later than 1802, as they have not been called to the Infinity Fortress all together in 113 years.

## Unknown

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* Kanae and Shinobu's parents get killed by demons, both get saved by Gyomei.
* One Winged Butterfly: Kanae and Shinobu return to Gyomei to express gratitude and begs him to train them. They pass Gyomei's test to move a boulder and are introduced to a different cultivator.

???

* One Winged Butterfly: Kanae and Shinobu trained under their own cultivator, passed the Final Selection and were reunited. Few years later Kanae died.

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* Bonus Manga: Kanae and Shinobu takes Kanao in

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* Signpost of the Wind: Sanemi and Masachika meet during a demon attack.

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* Special One Shot: Kyojuro passes Final Selection and goes on his first mission (Flute Demon)

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* The Flower and the Beast: Kiyo gets taken in at Butterfly Mansion after her family gets killed. Kanae gives her the butterfly hair ornament

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* Signpost of the Wind: Sanemi and Masachika (both Kinoe) defeats Ubume (Lower Rank One), Masachika dies. Sanemi gets promoted to Wind Hashira
* Chapter 168 (memory): Hashira Meeting is held after Ubume's defeat with Kagaya, Sanemi (first time), Gyomei, Tengen, Giyu, Kanae

???

* Ruka dies. Shinjuro starts drinking and loses will to fight
* Mitsuri starts training to become a Demon Slayer
* 6 months later, Mitsuri participates in Final Selection and passes.
* Kyojuro Gaiden: Mitsuri just officially joined Demon Slayer Corps and is ranked Mizunoto. Kyojuro is Kinoe. He gifts her the white haori that she will continue to wear
* Kagaya invites Hashira to semiannual Hashira meeting. Shinjuro refuses to go.
* The Hashira meeting is held and is attended by Kagaya, Gyomei, Sanemi, Tengen, Shinobu, Giyu and Kyojuro in his father's place
* Kagaya informs that a Twelve Kizuki demon (Hairo) had appeared in Shinjuro's designated region
* Kyojuro, Mitsuri and a group of Demon Slayers go to Tokyo capital and defeats him
* A Hashira meeting is held with the same group and Kyojuro officially joins as Hashira

???

* 1.5 years after Mitsuri becomes a Demon Slayer: becomes a Hashira

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* Kyojuro Gaiden ending: Kyojuro dies in fight against Akaza
* Cherry blossom season (spring): Obanai asks Mitsuri what's wrong

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* For You Who Does Not Smile (flashback): Emergency Hashira meeting held by Gyomei about Kagaya's wish to make Giyu smile. The Hashira have a arm wrestling contest on

Uzui's suggestion, then Mitsuri tickles Giyu, then Kyojuro pretends he can't find his glasses, then Sanemi invites Giyu to eat with him but Giyu refuses.

* Chapter 129: Hashira meeting about mark
* One Winged-Butterfly: Shinobu tells Gyomei that she can't participate in the Hashira Training, because she needs to prepare poison. Gyomei knew that she was hurrying to her death.

* Chapter 130: Tanjiro says the training will help Zenitsu make a great future
* The Right Way to Recommend a Hot Spring: Zenitsu trains under Tengen for Stamina Training in the Hashira Training, gets the task to dig out a hot spring

* The Flower and the Beast: Inosuke heads to Butterfly Mansion to get his injuries treated, and teaches Nezuko to say his name. He unintentionally offended Kiyo Terauchi about her lost hair ornament, gets scolded by Kanao and then discusses with Tanjiro about it. He then goes to find it.
* Chapter 128: Nezuko tells Zenitsu "Welcome back, Inosuke" enraging him. It is explained that Inosuke visited the Butterfly Mansion a few days ago and made it his mission to make sure that Nezuko remembered his name.

* Chapter 136: Tanjiro goes to Giyu's bamboo forest for the last session of the Hashira Training, being the only one reaching the last stage, and sees Giyu sparring with Sanemi. Sanemi knocks Tanjiro out.
* For You Who Does Not Smile: Tanjiro talks to Giyu after waking him up from the knock-out.

????

* Mitsuri told Shinobu her reason for joining
* 12 days later, Hashira meeting
* Kanroji Mitsuri’s Secret: Iguro asks Shinobu what's wrong

## Meiji (1868-1912)

* The following hundred years is full of a cycle of Pillars and the Twelve Moons pit against each other while the common riffraff fight the common riffraff. While the Pillars kill Lower Moons as a rite of passage and they are constantly changed out as openings occur, the unchanged Upper Moons routinely kill and eat Pillars. Even at the bottom rung, Daki has eaten 7 and Gyutaro has eaten 15. For each of those Pillars, at least one Lower Moon or fifty demons has died.
* Hand Demon becomes demon.
* 1863 and 1869: Hairou, a Shinsengumi member, becomes a demon.
* 1907-1909: In spring, Tengen meets Kagaya, around age 15~17 at this meeting, presumably after attaining Sound Pillar rank. EP41. Kagaya shows first signs of illness around his right eye.

## Taishō (1912-1926)

### 1913

* Wanting to get close to business partners, Muzan identifies a high society woman named Rei, kills her husband, and swoops in to be her new lover.

### 1915

* Around 2-3 months; Functional Recovery Training, which Tanjiro and Inosuke participate in for 14 days while Zenitsu spends more time in recovery.
	+ Once Zenitsu starts, he and Inosuke both quit within 6 days.
		- Tanjiro spends another 10 straight days losing to Kanao. He then engages in 15 days of Breath training on his own before having a little rooftop talk with Shinobu, and then in another 10 days, he’s able to blow up a big gourd.
		- While there might had been more days in between, Zenitsu and Inosuke finally come around and start Breath training too, and 9 days later, they are able to maintain constant Total Concentration Breathing (this speed is attributed to Shinobu being a good teacher and Tanjiro sucking at teaching).
		- For Whose Sake: During Zenitsu's training of Concentration Breathing, at night, Zenitsu takes Nezuko out on a walk to a nearby flower patch, and reminisces on the memories of his training with his master. During one instance, he escaped his lesson and discovered a girl crying in the forest. Upon asking what's wrong, the girl named Sayuri reveals that she has been offered to a nearby Demon by her step-father, as a sacrifice for her family's protection. Outraged, Zenitsu sets off to locate and defeat the Demon in order to protect Sayuri.
		- Over some indeterminate number of days later, Tanjiro & Inosuke receive new swords, and Enmu receives a big whopping of Muzan blood.
* Mugen Train: Tanjiro & Co. receive their mission, and some indeterminate number of days later (very possibly the same day), they arrive at the train station, and spend one night in battle. Kyojuro dies.
* While we don’t know how long they kept Tanjiro in bed before he went out to the Rengoku estate (possibly quite a distance away in a southwest Tokyo suburb), but at least long enough for the funeral proceedings to already be over and done with.
* Four months following Rengoku’s death, the boys generally reside and train at the Butterfly Mansion between individual missions they go on.
* The Chronicles of the Disturbances caused by Fortune Telling: the group is travelling back to the Butterfly Mansion after completing a mission. They enter a town buzzing with activity and Zenitsu is called by a fortune teller on the street. The fortune teller tells him that he will have horrible luck with women which will ultimately result in his death. Frightened by the sudden revelation Zenitsu, Inosuke, and Tanjiro must figure out a way to return home while avoiding women, for Zenitsu's sake.
* Tanjiro, Inosuke, and Zenitsu are all Kanoe.
* Summer: Chapter 70 Tengen tries to kidnap Aoi
* Aoi and Kanao: In the afternoon following her near kidnapping by the Sound Hashira, Aoi is called on by Shinobu to run a few errands. She informs Aoi that she will be sending Kanao to accompany her on her trip as well, leaving Aoi with an uneasy feeling. While at the apothecary, the girls discover they have forgotten their wallets and are forced to figure out a way to collect the items on their list, while bonding to become closer.
* Tanjiro and co go to Yoshiwara. Tanjiro & co spend only 1~2 nights undercover in Yoshiwara before the day Zenitsu encounters Daki. The following day Uzui tells Tanjiro & Inosuke to leave, but they all head into battle that night. Before sunrise, all three boys fall unconscious due to their injuries.
* Tanjiro spends the next two months in a coma.
* After waking up, Tanjiro spends one more week in bed and is soon recovered enough to go out to the Swordsmith Village (unclear number of days possibly spent in Functional Recovery, but he’s basically fully healed after that extra week in bed).
* Around september - november: Unclear number of days to reach Swordsmith Village, he hangs out with Mitsuri on the very first night there, gets hit with Genya’s tooth.
* The following day, Tanjiro meets Kotetsu and begins training with the Yoriichi Type Zero battle doll.
* Tanjiro’s starvation begins, he survives on rain water while Kotetsu denies him sustenance for the following 7 days. For the first 5 days the doll held paddles, but by the 7th day they’ve been exchanged for swords. Tanjiro gets a hit in and Kotetsu grants him food. Tanjiro continues training for an unclear number of days after that before the sword emerges. Tanjiro has held on to Genya’s tooth for well over a week.
* Chapter 129: Hotaru visits Tanjiro to give him the finished Yoriichi's sword. Tanjiro promises him that he will give him mitarashi dango till the day he dies.
* Haganezuka Hotaru’s Matchmaking Session: Tecchikawahara, Kanamori and Kotetsu eats the mitarashi dango that Tanjiro gifted. They set up a matchmaking session for Hotaru
* After Waking Up From a Dream: After the Swordsmith Village events, Genya is being treated at the Butterfly Mansion for his injuries

(By the Taisho period, blue spider lilies grow at the spot where Uta was buried.