Fukushuu Kijin  

Fukushuu Onihito, Human vengeance demon, 復讐鬼人

The story follows the journey of Susamaji as he seeks revenge for the cruel fate that befell his father. Despite becoming a demon himself, Susamaji remains steadfast in his quest to avenge Wakagimi's outrageous actions. Meanwhile, Shogo Kondo, a skilled swordsman, must face off against Susamaji and prove his own mastery of the blade.