Mizumura Shinta is unsure how to interpret the situation when Kishimoto Ririsu, the sexiest girl in school, begins to seduce him and things become extremely physical. Since Shinta is neither wealthy nor the popular guy at school, it makes no sense that Ririsu would be so interested in him. However, Ririsu is actually a vampire, a secret she will kill to keep hidden. As the relationship between Shinta and Ririsu develops, it becomes increasingly difficult for her to maintain this secrecy. When those close to him, such as his semi-romantic childhood friend Makimura Chizuru, are involuntarily drawn into the chaos, deep dark secrets are revealed.