Island in a Puddle manga volume 4 features story and art by Kei Sanbe, the creator of Erased.

Mistaken for Kuromatsu, a ruthless killer known in the underworld as “The Neck Breaker,” Minato finds himself caught between rival Yakuza factions and thrust into a situation he can’t run from. Meanwhile, the real Kuromatsu (a.k.a. the fake Minato) plots his next move against the man who set him up—a detective who happens to be an acquaintance of the Myojin siblings. Kuromatsu sends a video that threatens to expose the detective, but Minato has a surprise in store for both of them. The conclusion draws near in this gripping thriller from Kei Sanbe!