Daren "Dari" Avery and Charles have the fated arrangement of master and servant. In the depths of darkness, Dari scooped up the butler, Charles--a vampire. Possessing a fervid passion for service, Charles single-mindedly attends the secretive young master

The story is basically about Natsukawa Masuzu entering the lead's life., she is the typical perfect girl who is heartbreakingly gorgeous and has a well behaved personality with good manners(?), she also is a returnee from abroad and has a wealthy ojou-sam