The Boy and the Beast manga volume 4 features story by Mamoru Hosoda and art by Renji Asai.

Ichirohiko has suffered, caught in the space between human and beast, and has succumbed to the darkness. Kyuta leaves Kumatetsu, on the brink of death, in the care of the others and heads to the human world in pursuit of Ichirohiko. It's the start of a life and death battle in the streets of Shibuya to settle things not only with Ichirohiko, but with the darkness in his own heart...!! What can he do to save everyone? The times has come for Kumatetsu, Kyuta, and Kaede to each make their own decisions...