Out of nowhere, Nene finds herself being dragged inside a mirror, where she meets the spirit of a young boy calling himself Mitsuba. As the two attempt to escape fitogether, they soon find that danger worse than mere imprisonment lurks within the boundary of School Mystery No.3, the Hell of Mirrors. Nene may have fifinally gotten herself into a mess that even Hanako-kun can't save her from-but will someone else come to her rescue...?