You were yoriichi’s Tsuguko while you were training (alone), an upper moon demon came up behind you and kidnapped you. After a few hours, Yoriichi seemed worried and he started to track you down, once he got to where you were, he saw you with his brother, kokushibo.

Yoriichi: “give them back.” he said in a cold, stern voice. He didn’t like how kokushibo had you.

Kokushibo: “no. I’ll keep them. now you’ll know what it feels to get everything taken away from you by your brother.”