A very skilled elderly samurai hired by Ryujiro to assassinate Jin. He pretends to be a spineless "samurai by title only" when he is first seen. He uses barely subtle innuendo in his "fireflies" speech while he and Jin are in a hot spring, seemingly to manipulate Jin into a vulnerable position and facilitate the assassination. As Jin begins to leave, Inuyaka quickly lies about knowing the whereabouts of the Sunflower Samurai in order to lure Jin deep inside the woods, where the two do battle. Inuyaka comments upon Jin's skills, saying that if they were in a dojo Jin might be able to defeat him. The dialogue seems to indicate that Inuyaka is aware Jin killed Mariya Enshirou. Jin comes very close to defeat when Inuyaka senses Ryujiro's death and withdraws, saying there is no point in killing Jin if his employer cannot pay him. He remarks that he expects to cross paths with Jin again.