It's the fact that as the Headmaster is helping Atsushi, he's telling him he despises him. It's the fact that the Headmaster says he'll be gone after today. It's the fact that Atsushi doesn't blame himself for what happened to him anymore, and it's because of that realization that the Headmaster can finally leave him alone. It's the fact that Akutagawa realizes that he doesn't care about Dazai anymore, he cares about Atsushi and the lesson that Atsushi was trying to teach him, at the same time Atsushi is learning the lesson that Akutagawa was trying to teach himโthat he shouldn't blame himself for his past, just because of the Headmaster. It's the fact that Akutagawa heard him when he was a vampire. It's the fact that their souls are fundamentally connected through everything. It's That Which Drives Us to Act: A Mysterious Thing Called the Heart.
