Due to poor academic performance, Hosaka's parents invited a tutor to provide extra lessons for her. Unfortunately, her academic results did not improve, and instead worsened day by day because the tutor turned out to be a pervert. In the first tutoring session, he secretly stole her underwear, bra, and frequently touched sensitive areas of this innocent female student. After a few sessions, his true nature was revealed, not only bringing sex toys to stimulate her desires but also seducing her, deceiving her into having sexual relations with him. The young student, being inexperienced, followed the tutor's instructions as she thought that was the right thing to do.