Inu no Seikatsu (HINOMOTO Enji)

Katsura is brought to the mansion of Soichiro, the son of a rich family, as a playmate. The only thing in the world that Katsura desires is to be able to protect his beloved Soichiro. Eventually, the two of them begin a physical relationship, but then, suddenly, Soichiro disappears. After losing the person he wanted to protect, Katsura becomes a gangster...! from Renta! The chapters in this volume are: A Dog's Life Masters of the Ark Late Night The Coroner Object Mania Running to You like a Dog The Footsteps of Spring Who Knocked on my Door?