One For All V.2 JUS

Long ago, All For One, a man with a Quirk that allows him to steal other people’s Quirks and transfer them to others, forced a Quirk on his seemingly Quirkless younger brother, Yoichi. This Quirk allowed him to stockpile power within his body. However, unbeknownst to either one of them, Yoichi already had a Quirk with no other power than that it could be transferred to another person. The transference Quirk and the power stockpiling Quirk merged to form One For All.

After discovering this about his newly developed power, due to his strong sense of justice, Yoichi tried to defeat All For One, but given the huge difference in their strength, he failed. He decided to entrust the Quirk to future generations of heroes, hoping that they would be able to cultivate One For All and one day put a stop to All For One. He passed it on to the Second User, one of the heroes who had freed him from the prison cell where his brother was keeping him.