俺が聞かされた妻の寝取られ告白～ねえあなた、わたし今……とっても幸せよ～

A married couple, the Tayamas, took a vacation to a hot spring resort to celebrate their wedding anniversary. The husband was completely smitten with his curvy and beautiful wife, Mina, as he guided her around. The innkeeper suggested they try the beauty massage service offered by the inn. Mina had been struggling with her husband's one-sided assumptions and poor sexual skills, but she intended to endure it all. However, the masseur, Miyamoto, sensed Mina's distress and skillfully released her pent-up frustration through pleasure. Miyamoto exposed Mina's hidden lustful side, and during their trip, he would call her away for lewd encounters. These encounters became increasingly intense, and eventually— "For couples struggling with sexual issues, please visit our inn. We will help you discover a new form of marital bliss!" [Translated from Getchu]