Villain and hero's (Muitan)

For this story obviously there are heroes villains and one other but you'll figure that out later There's also my own OC Aya which is Tanjiro twin sister.
Tanjiro is a hero along with the rest of his family a mark decides whether you're a villain or a hero when you turn 15 you're supposed to get powers but Tanjiro never got his and his old friends start Bully him and his family other than Nezuko and Aya treat him differently.
He's 17 now and hasn't felt loved until he meets Muichiro Tokito a villain with the power of ice...