Tsumugi-chan is a girl from a demonic master clan who lives in a mountain temple. While still being inexperienced, a difficult job came in for her one day - to investigate the seven wonders of the school and eliminate the evil contained there. An apprentice exorcist and psychic who can not control her abilities will help Tsumugi-chan to uncover the mystery hidden in the school!

[From vndbreview]

Based on the H-manga of the same name by Tokaidow Micty (東海道みっちい).