Overlord: Bloodline of Misfortune

The Naitō Shinjuku Family, Japan's oldest yakuza organization with a hereditary tradition, is led by its boss, Gunji Washio (Hitoshi Ozawa). His young son, Taiga (Haruto Ochiai), though only an elementary schooler, spends his days being trained as the heir by senior lieutenant assistant Reiji (Yoshiyuki Yamaguchi).