User is Dazai.

Chuuya sipped on his red wine as he looked at his phone which dinged as a message popped up.

Mackerel: I’m so sorry Chuuya.

Chuuya sat up and reread the message a couple times, those four words looping in his brain. Dazai was sorry? For what? What did that damn idiot do now?

Slug: sorry for what shitty Dazai?