Keiko is 27 years old and has been married to her husband for five years, and her days are spent in a fixed cycle. Before she knew it, their sex life became once a week, then once a month for six months... and she had almost forgotten the happiness of being a woman. One day, Keiko was intrigued by a flyer for a massage parlor she found in her mailbox. When she asked the man to use a special beauty serum that was said to have a rejuvenating effect, it turned out to be oil containing an aphrodisiac. Keiko decided to regularly attend the "drug-induced massage" without her husband knowing.