Mami Takano (Tomomi Nakatsuka) works at a hair salon which specializes in hair extensions. The customers are attracted by the high level of skill used by the salon. The hair extensions itself are from real women. A dark organization is responsible for ripping off the hair from live women and killing them. One day, customers with hair extensions are killed in sequence.
Airi is a graduate student with a degree in the study of folklore. As part of her research, she decided to go to a small village with a group of friends, to investigate local legends. She does not know that the people worshiped the Slit-Mouthed woman as a living god, and intend to use her and her friends as a human sacrifice. In the end, Airi is injured and decides to fight, becoming a Slit-Mouth hunter.”
High school student Kasumi Ogino is a member of the school choir and after years of praise for her singing voice thinks she is the absolute bee’s knees. When the object of her desires, classmate and photographer Junichi Makimura, asks Kasumi is he can photograph her singing she accepts, thinking this means she is beautiful as well. However the end result is a comical shot of Kasumi with her mouth wide open, which Makimura likes to a hungry salmon! Distraught by the ensuing humiliation, Kasumi quits the choir, until she is encouraged to return by an unlikely counsel - the brutish leader of thuggish rival all male choir, Hiroshi Gondo.
