Kiyoshi's mother, Sayaka, has been an object of admiration for Junshi since he was young. Junshi accidentally sees his father, Kenta, and Sayaka kissing. Invited by Kiyoshi, he goes to the Kanzaki house as usual, but feels only awkward in front of Sayaka... In this situation, Kiyoshi is late, so Junshi heads to the Kanzaki house alone. He calls out but gets no response. Upon entering, he sees Sayaka masturbating. Unable to bear seeing Sayaka's feminine form, Junshi attacks her. Overcome by desire, Junshi torments Sayaka in every way possible, and Sayaka gradually becomes a slave to her own desires...
