Mari who decided to live with her father-in-law and brother-in-law due to her mother's remarriage.Her new brother-in-law happened to be in the same school as Mari.The soft-spoken and kind-hearted brother-in-law gradually reveals his true colors in the shared life.She masturbates without leaving her sleeping Mari, and her sexual desire that she can not stand is carried out at night.And Mari continues to be mercilessly fucked at school all the time!Mari's brain rejection and physical climax that never falls!It is the emergence of a new series of villainy with no escape!