The Tomozuki couple, troubled by their husband's erectile dysfunction, find an advertisement for a hot spring said to enhance virility and decide to take a trip there, also to help their father-in-law recuperate. While they hoped for a miracle cure, the husband sees no effect... but to their surprise, it works wonders for his father! Faced with his unwillingly rock-hard erection, Ruisa, ever the dutiful caregiver, gently attends to his needs. However, once awakened, the father-in-
