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

After resolving the incident at the peace memorial, Theo and Eleven have officially become investigative partners. Soon, the special investigation unit receives a tip about a suspicious 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, there's trouble stirring…