"You, go to an island with Kiria's son." One day, Tohru is told this by his father, who is the 5th boss of the Suki Clan. A huge war in the Yakuza world is expected in the near future, so he is given an order to hide on the island. After that, Tohru and Mutsumi Kiria begin their secluded life together, and before they realize it...