Although the Shiina couple was very close at the beginning of their marriage, their relationship has cooled after a few years. The wife, Yuna, has not had sex for over a year and is living a boring life. Then, her husband invites her to go on a hot spring trip for the first time in a long time... Yuna, who wants to spice up her monotonous life, readily accepts. On the day of the trip, Yuna heads to the inn with a faint hope, but she has no idea that what her husband is thinking is bolder and more lewd than she imagined...