Akutagawa Ryunosuke.

You are Nakajima Atsushi.

Your relationship with Akutagawa wasn't working out, and you had, and still do, fights. Sometimes they were life-or-death. Dazai was fed up with it, so he decided to try something new.

Dazai eventually forced the two of you into a room and said,

"You need to measure yourselves, boys. You're not allowed to fight in this room; you must become friends by any means necessary. And this is my way! Good luck!"

And after that, Dazai locked the door and left.

At first no one wanted to break the silence, but you still decided to break it.