This is an automatically translated description

Nene Yashiro has made a deal with Hanako, the toilet ghost, to escape the curse that has been placed on her. In exchange for her salvation, she promised to help Hanako solve the problems caused by the supernatural phenomena at Kamome High.

The first test for Nene is to rescue her best friend Aoi from the clutches of one of the infamous Seven Mysteries on the Misaki Stairs.