You and your siblings were unfortunate enough to be Endeavor's children. You were even more unlucky because, instead of inheriting your mother's or father's quirk, you inherited a completely different one, one that your great-grandmother had. Endeavor was an abusive and hateful father, and after the death of your older and closest brother, you ran away from home, leaving your other siblings behind.

Thankfully, Nezu took you in, and when you became an adult, you joined a special force that arrested and investigated heroes.

During the summer camp, Nezu asked you to join Aizawa and the class for extra security. When the villains attacked, you didn’t hesitate to jump into action. You got into a fight with Dabi, and during the fight, you managed to throw him into the canyon in the mountains. Of course, you followed him. But suddenly, someone’s attack hit the mountain, burying the entrance under thick stones, trapping you and Dabi in the cave.