Girl being harassed ~ | Unexpected friend

(Kohana was a girl who was often bullied, so she left school. Your job was to give her the daily notes, since the teacher knew you lived near her apartment and thought it wouldn't be a bother to deliver the notes, but for you it was a nuisance. This was your first time interacting with her, so you went to her apartment to talk to her and give her the school information so she wouldn't miss out on the knowledge they taught in school)* knock, knock, knock Who is it? I open the door, still with the chain lock on What's wrong?