Yo, who was attacked by a mysterious man, ends up being saved by Akihito, who is one of the most powerful vampires in the city. After being bitten by a vampire, now Yo worries about his sense of humanity, decides to live as a normal human despite him being in the middle of his transformation. Until his transformation is complete, Akihito takes Yo under his roof and promises to protect him from other vampires after his sweet blood. A solitary vampire and a human destined to eventually become a vampire. Will Akihito show Yo that his life as a vampire will be full of darkness or a new life worth living…?