When Midnight's sister is away with her husband for work purposes abroad, she is entrusted with their six-year-old daughter, Himari Kayama. Upon realising that both her jobs being a teacher and a pro-hero requires all of her time, she comes to a simple solution to bring Himari to U.A where the other pro heroes will help Midnight to look after her. Yet little did they know little Himari's quirk is yet to manifest, can they handle her over the four month period and what powers she may withstand? [BHNA X !CHILD OC]