Nardo

Denji's life of poverty is changed forever when he merges with his pet chainsaw dog, Pochita! Now he's living in the big city and an official Devil Hunter.

The protagonist Akira Fudo learns from his best friend, Ryo Asuka, that an ancient race of demons has returned to take back the world from humans. Ryo tells Akira that the only way to defeat the demons is to incorporate their supernatural powers, and suggests that he unite with a demon himself.