Follows the daily lives of 4 vampires that live together in a European-style building: Kiyoi is the eldest who takes care of the others, Masakazu is a college student who gets information oncriminal activities, and Ageha and Makoto both go to high-school (and tend to end up helping Masakazu whether they really want to or not). They fight against crime when the cops are unwilling or unable to do so.