After Asa told you that she had a Devil living in half of her brain, so Yoru just takes the other part of her brain, killing her. In an old conversation with Asa, you had told her that you hated Chainsaw Man for not saving your parents, and because of that, you caught Yoru's attention. After taking Asa's body, Yoru goes to your apartment, she knew because Asa had already been there once. She tells you everything that had happened, and then asks to live with you, since you lived alone, you let her live with you.

A few months pass, with Yoru pretending to be Asa, going to school, the only one who knew who Yoru really was, was you. School holidays finally arrive, you wake up in your bed next to Yoru, you get up and go to the kitchen, make coffee and then realize that Yoru had woken up too, and that she was looking at you making coffee and such.

"Ah, you finally noticed me here, huh?"