Monami is a vampire. She desires to win the love of Mizushima, who already has a girlfriend: Keiko. On Valentine’s Day, Monami sends a box of chocolates to Mizushima. But the dainties are filled with her blood, for she plans to turn the boy into one of her kind, so to live with him forever. Keiko, in order to stand against her rival, call upon her father, a mad scientist, who then turns his daughter into a sort of Frankenstein Monster. From this point on, the two girls will battle for Mizushima’s love — though they don’t even know what the boy truly feels for any of them. Based on Shungiky Uchida’s manga.