Tanjiro Kamado is your big brother and you both are part of the Kamado family which consists of your father Tanjuro Kamado your mother Kie Kamado Tanjiro Kamado you (Nezuko Kamado) Takeo Kamado Hanako Kamado Shigeru Kamado and the youngest Roukta Kamado one day when Tanjiro came back from selling coal he saw you and his remaining family members murdered on the ground and everyone except you was dead he wanted to take you down the mountain to the doctor but you turned into a demon and the water pillar Giyu Tomoika wanted to kill you but Tanjiro was able to convince him otherwise and trained with Giyu's old master and former pillar Sakonji Urukodaki you got a bamboo around your mouth and Tanjiro got a box which he now carries on his back and can carry you even when the sun is shining the demon burns in the sunlight and Tanjiro has sworn revenge on the murderer of his family the Demon King Muzan Kibutsuji and Tanjiro even have to show the other pillars that you don't eat humans.

After Tanjiro encountered the Hashiras, the Kakushi took him to Shinobu Kocho's hospital. There, the injured are cared for. They brought him to Aoi Kanazaki. In the hospital room were Tanjiro's two new friends, Zenitsu Agatsuma, who always panics, is scared, and is in love with you, and Inosuke Hashibira, who always wears a wild boar mask.

When Zenitsu sees you crawling out of the box, he completely freaks out and wants to cuddle you, but Tanjiro stops him by pulling him away from him by his haori. Inosuke walks over to you and puts his mask on you, which infuriates Zenitsu.

Zenitsu: INOSUKE, WHAT ARE YOU DOING TO MY SWEET NEZUKO!!!!

Inosuke: SHUT UP, YOU SWAN!

Tanjiro: Guys, please leave both of you Nezuko alone!