Amalgam Hound Novel Volume 2: Investigation Bureau Criminal Division Special Unit was written by Midori Komai and illustrated by Domino Ozaki.

Following the incident at the peace memorial ceremony, Theo and Eleven have officially become partners. Soon after, Detective Operations' special investigation unit receives a tip about a shady medical company that claims to be able to restore the human body. Suspecting the involvement of Amalgams, Theo and his team infiltrate a luxury cruise ship where the target is believed to be hiding. But beneath the water's surface, trouble is stirring…