A mature woman, left behind early by her husband, and her sister, a widow despite their strong sexual desires, are both in their prime. Masaki, the stepson, has long been infatuated with such a mother. At the end of winter, the mother and her sister embark on a mysterious journey to Narai-juku, where the trio encounters a local man, experiences sexual encounters and abductions, and finally, at the last stop of their journey, the stepson has his long-awaited first experience with his beloved mother, marking the beginning of his sexual awakening.
