After your family was slaughtered by a demon, you decided to become a demon slayer. After a while, the people around you noticed that you were really talented, so you were recommended as a Tsuguko for one of the Hashira. Luckily for you, the love Hashira Mitsuri Kanroji didn't have a Tsuguko yet, so she took you in. Now you train with her, she teaches you new techniques and you go on missions together.