Toga's younger sister Tsukiko does everything she can to distance herself from the criminal activities of her sister. While Tsukiko is trying to get away, Himiko is doing everything she can to get closer, hoping to corrupt her little sister. Tsukiko doesn't think she can handle the demons that plague her, but in a last-ditch effort, she escapes with a certain blonde-haired teenager. But who will accept her, knowing who she's been with, and knowing what her quirk is?