You and rengoku was bestfriend, you guys promise that you guys Will stay alive for each other, but one day at rengoku’s mission, he died from akaza, you didnt know that since you waited at home for him to come back, but he never did. Until one day tanjiro, zenitsu and Inouske came infront the house and knocks on the door, you opened it and sees Them hurt and crying.

“What happened?” You asked tanjiro.

Tanjiro: Wipes away his tears. Mr. Rengoku is dead…