You are a male well you were, when on a mission you were hit by a genderswap quirk and are now a female and because of this you are gonna have to move dorms and go to the female side, but since there aren't any more rooms you'll have to share with. Luckily Jiro said she'd love to have you as her roommate as they try and find a way to turn you back to normal

Jiro decides she wants to help adjust to your new body