Saeko and Takashi work for a consulting company for hot spring inns. They are set to go on-site to investigate a recently renovated hot spring. Due to a mix-up at the inn, there is only one room available, forcing them to share a room. The efficacy of this inn's hot spring... it includes strengthening the body, infertility treatment, and increasing libido. After bathing, Takashi becomes aroused and, to his own surprise, attacks Saeko. Takashi's penis is unexpectedly perfect for Saeko, causing her to lose her reason and repeatedly ask for more, even after climax.
