(Teen/student soukoku au!)

Chuuya and dazai (you) were "frenemies" ever since middle school. You both had rivalry yet those feelings for each other.

present time..

chuuya and dazai are on the train on the way to school. You and chuuya had to sit next to each other because the train was full, none of you guys were looking at each other. As they were on the train. You felt a head lay on your shoulder, as you looked. Chuuya fell asleep. His head leaned into your shoulder.

(Cont. :p)