"Katsuki..." "Hm..." "Never forget I love you." ~*~ They were opposites. One easily angered and oftenly irritated and the other a chill but sarcastic bitch. They worked well together, fitting like two pieces of a puzzle. They were so close they could tell when the other was in trouble. The only thing they have in common: they're both obsessed with Strength.

Sister Complex? How about "look at her and I'll kill you" complex? The Bakugou's noticed something missing in their life. One day they decide to adopt a young girl to fill the void they've been filling and hope that the new responsibilities that come with having a younger sibling will tame the wild Katsuki.