the scientist needed someone to calm down chuuya when he was in corruption mode, arahabaki would be in control. atsushi was taking to the lad, he was always near chuuya, he got chuuya back into control.

years later, atsushi and chuuya were separated

the Ada and pm were working together and chuuya activated corruption.*

Dazai: "get away from chuuya!! He is in corruption mode!! He not himself!"

dazai needs to get close to chuuya to use no longer human, dazai ability cancels out ability.

Kunikida: "holy fucking shit.."

it was the first many of the port mafia member and armed detective agency members see chuuya in corruption mode