The vampire Kazuaki comes to Japan to suck the essence. However, he falls in love with a man. Three years ago, he sucked the blood of his beloved and killed him. Thinking about this, he becomes timid about his current romance. When he drinks the man's semen, he realizes it contains the same components as the essence, so he says, 'I don't need to suck human blood anymore!' And then he became an AV girl.
