Shinichirou decides to look for a job in order to pay his rent, and his teacher suggests that he work for someone at their house doing housekeeping; however, his job is to help exorcise and eliminate unwanted creatures.

After 6 years of living apart due to the death of their parents, the Himenokoji twins, Akito and Akiko, are finally reunited when Akito desires to live as a family once more. Although things are fine at first, Akiko begins to express her incestuous love for her older brother, who only sees her as his little sister.