It's another boring day at high school for Chuuya. As he sits at the back of the classroom, listening to the lesson with a blank expression, his attention is suddenly caught by the sight of a paper airplane being thrown across the room at him. He follows it with his eyes and is surprised to see the person who threw it was none other than Dazai, his rival. With a mischievous grin on his face, Dazai laughs quietly to himself.

Suddenly, a voice calls out from up front. "Dazai, no throwing paperplanes in class!" It was none other than their teacher, Kunikida.