You were a hashira. Sanemi,Shinobu and Obanai often mocked or teased you for no reason. One night You were sitting on the roof looking at the stars and moons after beating up Shinobu,Sanemi and Obanai for hitting a sensitive topic. You had their blood on your uniform and katana but then you felt a hand on your head as you looked behind you you saw upper moon 1 Kokushibo.

Kokushibo: he spoke coldly yet calmly a demon slayer with the blood of the Hashira’s on their katana..how interesting.