Hikari Uchiha's Story

Nanashi was born as "Hikari Uchiha" by her parents, who wished her to live her life in the sunshine as much as possible, hence her birthname. However, her parents were killed at some point during the vicious war-torn Warring States Period, leaving her orphaned. Once her fellow Uchiha Clan members discovered Nanashi's powerful abilities, they decided to use her as a weapon for battle, telling her only purpose was to serve them in battle, and gave her the name "Nanashi" to signify her lack of identity as a human being. For several years, Nanashi was kept locked away by her own clansmen, being treated as a weapon, often being referred only as "it" by others. Ultimately, however, during a battle against the Senju Clan, Nanashi's power forced them to retreat, only for them to return with assistance from the Sarutobi Clan, who managed to defeat the Uchiha and seal Nanashi away in a scroll, preventing her from being used again for battle.

Nanashi remained sealed away for the duration of the Warring States Period, and throughout each of the Shinobi World Wars, well into the modern era, where she was unsealed by Merz and Teguse, of Zero. Manipulating Nanashi's hatred for the shinobi world, he promised revenge by plunging the world into anarchy. Nanashi, who was already immersed in hatred, accepted his offer and began to work with Zero.

Initially appearing as a guide character in the game "Ninja Heroes", Nanashi met Boruto Uzumaki. Initially, they did not get along, as Nanashi found Boruto's energy to be irksome. Regardless, she humoured him, and helped Boruto through the initial stages of the game. While doing this, she began to realise what kind of person Boruto was.

During the setting for a special event, where Kiseki were gathered, Nanashi initially tried to discourage Boruto from participating. However, after he did, and won a 'winner' Kiseki, Nanashi had to set Zero's plan into action, utilising the Engraved Tsukuyomi to place the entire shinobi world under her mark. She then used Yachihoko to begin erasing the memories of everyone affected, and force them to prepare for the Fifth Shinobi World War.

Eventually, Nanashi was confronted by Boruto in Ninja Heroes, and when finally called out on her part in the chaos, Nanashi revealed her true appearance and face, fighting Team 7 within her Illusion Technique. Having been fought off, Nanashi returned to Zero, and no longer wished to monitor the Genjutsu World of Ninja Heroes.

After the Yachihoko and its effects were broken, by the efforts of Team 7 and Toneri Ōtsutsuki, Nanashi was confronted by Boruto in Zero's hideout. Desperate to realise her dream and her plans, she fought against Boruto, who managed to break through to Nanashi, appealing to the good within her heart. Releasing that she cared for Boruto, Nanashi surrended. Because of her weakness, Teguse and Zero implemented their control device over Nanashi, forcing her to fight Boruto at full power. Naruto Uzumaki and Sasuke Uchiha intervened, saving Boruto.

Merz discarded Nanashi, and began to fight Naruto and Sasuke. Nanashi, however, used Yachihoko to give Boruto all of her gathered chakra, allowing Boruto to fight alongside his father and teacher and defeat Merza's Complete Body: Susanoo. She then died in Boruto's arms, imparting on him a Kiseki that had their combined memories and chakras.

When Boruto traveled back in time to the Warring States Period with the help of Toneri Ōtsutsuki, Nanashi's history was changed when Boruto rescued her from captivity. She fought alongside Boruto against her clan, earning her freedom with his help. Getting her to safety, Nanashi learned her true name from Boruto. Nanashi was able to live a modest and normal life away from war, and spent the rest of her life in gratitude to Boruto, even leaving an anecdote behind sharing how much he changed her life for the better.