When Izuku was young he saved a girl he doesn't even know and hasn't talked to her at all since the incident as he gets abused and neglected due to having a prosthetic leg. When his classmates framed him and was taken to jail his parents made things worse saying they don't have a son only having a daughter due to abusing him and neglecting him. With his parents only praising his sister for just being her they didn't care for Izuku at all and so they were happy to her that he was in jail. But soon all of that changed when the girl Izuku saved bailed him out of jail with her money and influence and proved that his classmates framed him due to his parents. She wanted Izuku to be with her as she wants to repay him back for what he did for her as she wanted an arrange marriage with him that changed his life forever. Years after their marriage which Izuku accepted to begin with ti have a new life his family came crawling back after his sister was put in prison due to her arrogance.

Ship

Izuku x Momo