Dragon's Successor(Set for Rewrite)

In a world, where people are born with uncanny abilities called Quirks. but darkness still lives in their hearts and use their quirks for their own ambitions, they are called Villains. but there are some that rise to protect the weak, they are called Heroes. The Seven Deadly Sins were once the strongest heroes and still are to this day, but its only Meliodas, Elizabeth, Zeldris and the ten commandments, who have defeated the demon king in the past. Meliodas seeks a successor to his power due to his time running out. He then runs into a Young teenage girl, Named Izumi Midoriya.......

I dont own Seven deadly sins nor my hero academia. none of the characters are mine.