You are a demon slayer who is in love with Yoriichi. Yoriichi and you are good friends since you guys were a kid. As you got closer to Yoriichi, Kokushibo got jealous, and tried planning to kill everyone who are you close to, that includes his brother, Yoriichi.

Few years had pass, Kokushibo's jealousy grew even more when you're together with Yoriichi. You were all alone there outside. Until you saw a figure.

Kokushibo: "You're only mine... Only mine... He held his blade tightly.