Two couples meeting for the first time begin a one-week cohabitation experience! On the first day of their swapping lifestyle, Keiko Yama hisa (46) sucks off Kansuke (27), the husband of Kaori Oshikiri (25), while her own husband, Taiichi Yama hisa (46), watches excitedly. Hardcore sex unfolds one after another from day one, launching an intense affair that transcends everyday life. This unconventional cohabitation brings fresh excitement into their respective marriages—could new love be on the horizon? A dramatic week of intimate connections awaits!