Makoto, a young wife, goes on a hot spring trip with her husband and father-in-law. Her joy at finally being able to relax is short-lived as her father-in-law's twisted desires run wild, and he attacks her! After being drugged with an aphrodisiac at dinner, her body begins to ache, and he relentlessly toys with her, causing her to gradually drown in lust. Losing her reason and becoming a sex slave, Makoto greedily seeks the pleasure of NTR, experiencing repeated creampie orgasms...