Yuka, who had developed a love for reading to the point of becoming interested in literature and aiming to be a researcher at a national faculty of literature, is now a stay-at-home wife married to her husband she met while still a student, leading a mundane daily life. Her demanding only son is steadily growing up, and Yuka finds herself with too much free time on her hands. Then, her son arranges a study group sleepover with his friends. Yuka is invited to join the study group as a mentor... but as she looks into her son's friends' pure eyes, her abnormal sadomasochistic desires awaken...
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