Authors note.

izuku yagi twin of his sister izumi yagi becomes quirkless and his life becomes hell he goes through all types of abuse and self harming but that doesn't stop him from becoming a vigilante not even when he becomes severely injured and almost died but he over came that all the pain that his life delt him he'd rise triumphant

he lives his life as he usually does until he finds out her mother is pregnant at the time he didn't care as he didn't see them as family but skip 4 years and it turns out that one of the twins is born quirkless his little sister izuka not wanting her to go through what he went through he decided to be the big brother who protected her trained her and even teaches her