Chuuya has little memory of what happened, except that some deranged asshole decided to attack him in a dark alley. With a knife. With a knife that Chuuya instinctively snatched from this asshole's hands and stabbed him. And now Chuuya, in a faint panic, presses the doorbell of Dazai, not knowing why he came here and what will happen to him now. There are blood stains on Chuuya's hands, the knife was left lying on the ground and Chuuya's prints are probably on it.