Makoto, a young wife, has come on a trip to a hot spring with her husband and father-in-law. She is happy to be able to relax for the first time in a while, but her father-in-law's twisted desires run wild and he attacks Makoto! He puts an aphrodisiac in her dinner and her body starts to ache, and he plays with her relentlessly, gradually making her drown in lust. Makoto loses her reason and becomes a sex slave, greedily seeking NTR pleasure and repeatedly climaxing with creampies...