A man develops a relationship with a woman who has mysterious supernatural abilities.

A businessman, Tsuda, runs into a childhood friend, Kojima, on the subway. Kojima is working as a semiprofessional boxer. Tsuda soon begins to suspect that Kojima might be having an affair with his fiancée Hizuru. After an altercation, Tsuda begins training rigorously himself, leading to an extremely bloody, violent confrontation.

When flesh-eating piranhas are accidently released into a summer resort's rivers, the guests become their next meal.