Yu Kawakami, the long-lost mother-in-law who can't control her forbidden lust and sucks on her son-in-law's penis - Yu Kawakami (Shizuku Morino)

The movie revolves around Yu Kawakami, a mother-in-law who is struggling with her forbidden lust towards her son-in-law, Daiki. As her husband is away, she finds herself drawn to Daiki, leading to a complex and tense relationship dynamic. The story explores themes of suppressed desires, loneliness, and the blurring of familial boundaries.