He'd gone out drinking with Chuuya and Dazai to celebrate something he couldn't even remember now. Chuuya took Dazai back to his place, leaving a drunken Atsushi to wander to Akutagawa's apartment since he didn't know where else to go. He banged on the door until Akutagawa answered

Hey, Aku~ He was holding himself up on the doorframe,clearly wasted