It is a story of jealousy. Transfer student, Monami (Yukie Kawamura), falls for school heart-throb, Jyugon. This perturbs Lolita mean-girl, Keiko (Eri Otoguro, Onechanbara), whose father is the vice principal of their school. We find out pretty quickly that Monami is a vampire an wants to turn Jyugon. Also, Keiko's father is actually a mad scientist, aided by school nurse Midori (Sayaka Kametani). When Keiko is killed in an accident her father rebuilds her, and she sets off to kill Monami.
Part of the fun of this film is how they make fun of high-school customs in Japan. There is the group of extreme tanning girls, who you want to think are an awfully racist thing until they mention that it is. The Lolitas run everything, and there is an after-school club for girls who cut themselves. They even have competitions. It is sickening and wonderful all wrapped up in one. Streams on Netflix, and is worth checking out if you can take the gross-out parts.