姑から孫の顔を見たいとせがまれている嫁の藍。ある日、姑が温泉旅行に行こうと提案してきた。乗り気の藍だったが、姑から温泉で子作りをするよう命じられ、さらに性欲が湧くという漢方茶まで飲まされる。旅行当日、漢方茶の効果で藍は旦那とのSEXでは満足できない程に興奮していた。一方、義父も精力旺盛で姑を抱こうとするが断られてしまう。お互い悶々とする中で、義父は藍の裸を偶然見てしまい、我慢できなくなって…。
Ai, the daughter-in-law, is asked by her mother-in-law to see her grandchild’s face. One day, her mother-in-law suggested going on a hot spring trip. It was Ai who was enthusiastic about her, but her mother-in-law ordered her to make a child at a hot spring, and she was even made to drink Chinese herbal tea that her sexual desire springs up. On the day of her trip, Ai was so excited that she could not be satisfied with sex with her husband due to the effect of Chinese herbal tea. On the other hand, her father-in-law is also energetic and tries to hold her mother-in-law, but she refuses. In the midst of each other’s agony, her father-in-law accidentally saw her naked indigo and couldn’t stand it.