Preparation for the cultural festival have begun. As president and vice president of the student council, as well as a couple, Reiko and Shintaro are given the jobs of keeping tabs on the preparation together. While browsing through campus, they find a fellow student who request they sample the drink he was making for the festival. Suddenly, not knowing why, Reiko starts feeling aroused and decides to take Shintaro into a classroom set up as a dark maze. Shortly while inside the two are separated and when reunited, Reiko finds herself unable to control her urges and allows Shintaro to help release her sexual desires but only to find out it wasn’t him who found her, Shintaro had already left the room.Shintaro has noticed that Reiko has been acting strange after the incident he knows nothing about and decides to consult Misaki for help, another member of the student council. She suspects Reiko is tired from the preparation work for the cultural festival and the two decide they all take a trip to an amusement park. On the day of the trip, Shintaro and Reiko meet up but Misaki was no where to be found. Reiko suddenly receives a email on her phone. A shocking expression she lets out as she looks upon the image she receive, an image of what has happened to Misaki.

When Mishiro was small, half of his soul was eaten by a toothed deity. Since then he has had to deal with spirits called kotowari that reside in the darkness of the souls of people who are related to him, no matter how distant.Kotowari are soul fragments created from a person’s suffering and they can normally only be seen, heard and touched by that individual. Even if the kotowari is destroyed, it will keep respawning unless the cause of the suffering is resolved. Shortly after transferring to a school in a history-laden sightseeing town, Mishiro encounters a kotowari and decides to search for its owner.However, there isn’t just one kotowari as many other girls harbour their own suffering.

A student gets his hands on a device that allows him to modify the will of any targeted female - he can bring out the lust and any hidden feeling from their minds and use it to his advantage. He attacks many of his classmates with this new power.