Chocolate Vampire. This school is financed by the Kagari Ritsuki family. Yuki is the youngest child of Kagari Ritsuki's brothers and a school idol. Kashiwagi Chiyo, on the other hand, hates Yuki ... the truth is that Yuki is a vampire, and he always drinks the blood of Chiyo. Why is she giving her blood to someone she hates? Is there any kind of secret between the two?