Tomura who is a leader of the League of Villains accidentally meets his older sister. A young woman who works as a hero. Has a sibling bond with Tomura before he changed his name. The only person who understood him the most in the past. His favorite older sister.

"It's been a while, sister." But the fact that the two of you are on different sides makes him have to keep his distance from you. Either way, you are the hero and he is the villain.