Hydra - a small bar in the middle of Tokyo. There's Takashi, standoffish guy working where he hides his another identity of a highly skilled hit man now has to face a brutal killing game that he has been pointed as a target.

Keiko, the daughter of a legendary sushi chef, runs away from home when his Karate-style regimen becomes too severe. Finding work at a rural hot springs inn, she is ridiculed by the eccentric staff and guests.

Following a rampage of extreme prejudice, a savage killer targets women as he tries to find a compatible one to engage his fantasies of torture and murder in. With the body count mounting ...