"You are like your sister if the sex thing was the Halloween section of a store." Katrina Kayama lives in the shadow of her sister, the 18+ Only Hero: Midnight, the dominatrix and sadist hero. But to Katrina, she's only pain-in-the-ass Nemuri. When she goes to U.A., she has to establish herself as a serious hero and separate herself from her sister. [big 3 fanfiction]