I received an email from Yoshino-san after a long time. It seems her husband has been cheating. Thinking she needs a distraction, I planned a hot spring trip and invited Yoshino. Shinoyama, who is serious and cheerful, has her own troubles—she's unsatisfied with sex with her husband. She pretends to be content in front of him, but once he falls asleep, she spends her nights enjoying herself alone.