Anna picks up Kei, a mysterious knight who has taken a reverse trip to modern Japan. Anna was getting used to strange cohabitation, but the sexual desire she had left over after half a year of masturbation abstinence was already at its limit ...the man in front of her is polite but quiet, unfriendly, and stoic. Her curiosity begins to tingle. Because of "jealousy" and "misunderstanding," his dark obsession has taken over. What is the fate of these two people who can no longer go back anymore?