Rumors circulate that among Kamome Academy's Seven Mysteries, Hanako-kun has recruited a new aide: first‑year student Nene Yashiro. Together they probe the institution's enigmas, maintaining equilibrium between humans and the supernatural realm. Yet during leisure moments, they are frequently seen fooling around, orchestrating playful schemes with Yashiro's classmates and the hidden phantasms invisible to ordinary eyes in the quiet corridors during the night in the moonlit halls quietly.
