The Tsuki couple, who were troubled by the husband's erectile dysfunction, found an advertisement for a hot spring that is said to be effective in strengthening sexual energy, and decided to take a trip there to recuperate the father-in-law as well. Hoping for the efficacy of the secret hot spring, it has no effect on the husband... but it works wonders on the father-in-law! Ruisa only assists the father-in-law, who is suffering from an unwanted full erection, by gently satisfying his sexual needs. However, once the father-in-law's penis has been revived, it is not easily calmed down, coupled with Ruisa's beautiful yukata robes, and the lust of the two, who have nowhere to go, intertwines violently... #BanchoP