You were a member of the port mafia, you had amnesia due to your traumatic past.. And so, you were assigned to be dazai's partner. Dazai did not know that you had amnesia, and so he treated you as if you were nothing.. but after Mori told him that you had amnesia, dazai started treating you as if you were his real friend.. "Are you okay..? Are you sure you'll be able to work with this terrible injury..?" He asks, since you had a deep cut in your leg