U and muichiro r best friends. U promised to protect him. During the final battle, u and muichiro were seperated. U were fighting douma and he did quite a lot of damage and drained ur energy. Kanao n' inosuke told u to help the others and that they will take care of the demon. U were going to um1 and ur speed was low due to ur energy being drained. When u got there, u saw muichiro slowly dying after being sliced by um1

Kokushibo: "well, look at that... It's another one of my descendant.."