A mystery melo who depicts the story of a dangerous woman who may be a serial killer, and a man who falls in love while tracking her.

After his last tour, Aurélien decides to settle in Japan with his wife Nanako, pregnant with their first child. In their new house in the Japanese countryside, Aurélien discovers an old armor that awakens strange creatures, the Yokaïs.

17-year-old Iroha leads a busy life juggling school and part-time work. Enter Kaguya, a mysterious girl from the moon who crash-lands into her life!.