At first glance, a family seems happy on a trip to a hot spring... but the daughter is drowning in a forbidden relationship, and the father is unable to refuse and continues the relationship. The daughter boldly invites her father even in front of her sleeping mother, but somewhere she wants her mother to notice her... Daddy is mine! A forbidden night at a hot spring inn... Suppressing their voices, the two drown in the thrill of immorality...