Misa Kuroi is an adorable high-school girl who arrives at her new school when it is falling under an evil supernatural force. Trying to figure out who's behind the supernatural attack, Misa also has to deal with assumptions by her fellow classmates that believe she is the one behind it all. Misa and twelve other students are kept late after school hours one day to retake an exam. Then, after sunset, the entire school is deserted, and the students find themselves trapped inside and their teacher no where to be found. One by one, the thirteen students are picked up and disposed of in horrific and graphic fashion. It is up to Misa to try and gain the trust of her fellow students so that she can protect them and stop the evil before it's too late.
In Meiji-era Japan, a village of witches and wizards is slaughtered. Years later, an archaeologist discovers a mummy from the village, which reanimates, murders, then possesses his assistant. This evil spirit is now searching for Misa, who is protected by a survivor of the original massacre, known only as Saiga.
At a high school in Tokyo, several of the female students have been moon-lighting as prostitutes. A teacher catches onto this fact and goes about putting an end to it. Things go awry when he discovers he turns into a sex demon with tentacles whenever he gets aroused or angry.
