A woman quits her job to inherit her family's bathhouse and reunites with her childhood friend, who was once a timid and weak girl, after 18 years. Using a vagina-shaped vibrator, they find themselves irresistibly aroused, engaging in sweaty sex during work breaks. (Kominato Yotsuba START-483)

Yotsuba returns to her hometown to inherit the family bathhouse. Eighteen years later, she reunites with her childhood friend Shuji, who has shed his timid and cowardly past and grown into a remarkable young man. Shuji begins helping Yotsuba with the family bathhouse, and the distance between them quickly closes.