You've been married for five years, have no children, and are living a stale marriage with your wife. One day, you catch the neighbor's wife, Asahi, in the act of infidelity. Noticing this, Asahi brings you back to her home and, as hush money, forces herself on you, leading to sex. Captivated by Asahi's sexual prowess, you go on a trip to Hakone at her invitation, but this trip is actually a trap set by someone. The future of their relationship...
