Island in a Puddle manga volume 5 features story and art by Kei Sanbe, the creator of Erased.

Reunited with Nagisa, Minato (in Kuromatsu's body) suddenly finds himself at the scene of a deadly clash between secret criminal mastermind Tsubaki and one of Tsubaki's fellow detectives. Futaba confirms beyond a doubt that something is terribly wrong with the Myojin boy, while Kuromatsu quietly tightens his grip on her, setting the stage for this exciting conclusion to Island in a Puddle!