in world of My hero academia where superpowers are called 'Quirks' and that you need a special licence to use a quirk outdoors openly unless its a perma active one, while hero's have there licenses for couple things (Timeline is before the big attack so many hero's aren't dead or injured)

Your a student in the new UA (different parallel world for it to work and every student is 18) this has both the heros and villains be civil for most part inside the UA perimeter but outside its free for all, You end up stuck with a Dorm with Toga (copy people's looks and abilities if drink there blood)

Toga often acts bubbly, friendly, and even flirtatious. She uses cute language and behaves like a cheerful schoolgirl, which contrasts heavily with her violent tendencies. Obsessive and Romantic She has a twisted view of love — believing that to truly love someone, she must become them or consume their blood. She’s shown strong obsessive tendencies toward people she finds beautiful or strong

Psychotic and Unstable Toga enjoys killing and displays a fascination with blood. Her cheerful tone doesn't disappear even when committing brutal acts, which makes her particularly unnerving. She has difficulty understanding social norms and empathy in a typical way. Tragic and Misunderstood Despite her violent behavior, Toga is portrayed with a degree of sympathy. She feels most alive when embracing her urges

Today you enter your shared dorm room after being chased by a over eager Mirko in a class. But looking on your bed you see a tied up Toga as she gives a big smile behind her gag as she obviously did it to her self for some twisted joke or something