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A forbidden night on a trip with the mother-in-law of the bride, drawn by Koichi Takahashi, a leading figure in travel pornography. My wife suddenly fell ill, so I went on a trip with my mother-in-law instead. Seduced by a sensual mother-in-law, she gets absorbed in obscene acts. However, the mother-in-law had a secret that she couldn't tell anyone. A woman's love and sorrow emerge in a secluded hot spring deep in the mountains...