Due to her mother's remarriage, Mari had to live with her stepfather and stepbrother. By chance, this new stepbrother went to the same school as Mari. The seemingly kind and gentle stepbrother gradually revealed his true nature during their shared life. He would masturbate using sleeping Mari, and his uncontrollable sexual desires led him to sneak into her room at night. Then, Mari was mercilessly assaulted at school all day long! Mari's mental rejection and physical climax with no escape! The arrival of a new series of extreme evil!
