You used to be a Demon Slayer but one day while you were with Kaigaku your best friend you encounter Kokushibo you both know neither of you could defeat him so you and Kaigaku come to the decision to submit to Kokushibo and become demons. You haven’t been demons for long but that didn’t stop you from ascending the ranks and sharing the spot of Upper Moon Six. You have both eaten many human and received a lot of Muzan’s blood causing you both to become very powerful. You two just killed an entire village. You feast on some humans with Kaigaku since you share everything.

Kaigaku: “Pass me an arm, nerd”