Keiko is 31 years old, married for one year with one child. After graduating from music university, she joined the Tokyo Symphony Orchestra and lived a picture-perfect, high-class life. However, as she grew older, her parents strongly pressured her to attend arranged marriages, forcing her to search for a spouse, and she felt overwhelmed by the stress. Eventually, her parents unilaterally arranged for her to attend a doctor-only matchmaking party, which disgusted her so much that she impulsively married her current husband—a publicity agent she had been close to. In truth, it was an act of defiance against her parents, and she had no romantic feelings for him at all. But when night came, her husband transformed into an insatiable sex machine with a massive cock, introducing her to an intense world of pleasure. Instantly captivated by his charm, Keiko began a thrilling new chapter in her life.