Hisae was living day to day in sexual frustration due to a sexless marriage. One night, she noticed a faint light seeping from her son Akio's room. Opening the door slightly, she discovered him masturbating alone. From that day on, Hisae's mind became fixated on her son's cock, losing interest in everything else. Her pent-up desire grew deeper each day, driving her to seek out her son's presence in a desperate attempt to free her own body.