A teenaged vampire girl named Monami (Yukie Kawamura) tries to win over her high school crush by converting him into a vampire via tainted Valentine’s Day chocolate.

When his current girlfriend, Keiko (Eri Otoguro of Onechanbara), tries to get revenge, she's quickly dispatched by the powerful Monami. Keiko's mad scientist father decides to piece her back together, complete with various "improvements" to help assist her in a rematch against the boyfriend-stealing vampire.