Chapter 1: The White Haired Siblings

Izuku and Izumi Midoriya the co-heirs to the famous Midoriya yakuza group and at the age of 5 the twins gain two bodyguards who are kids from the Todoroki family. After many years the twins gained nicknames due to their work in helping the family remain as one of the strongest yakuza groups with Izumi becoming the Midoriya's Silent Sword and Izuku becoming the Demon of the Yakuza.