26-year-old Rino graduated from junior college and worked at a major cosmetics company before meeting a man introduced by a friend who worked at a foreign firm. After dating for four years, they married. Now a mother of one daughter, she supports her family as a full-time housewife. Her husband's career is going well and she has no complaints about her family life, yet she feels an emotional emptiness beneath the surface of this perfect existence. Through a dating app, she meets a man who invites her on a one-night, two-day hot spring trip. Stepping outside her daily routine, she seeks new excitement and sensation. What she chooses is a brief adventure beyond the boundaries of security and safety.