Aki, a wife after living a happy three-person life with her husband and his son Hiroshi. But last year, the incident happened when her husband went on a business trip for half a year. Alone with her son-in-law in the absence of her husband ... Unable to endure the loneliness, Aki makes an overnight mistake with her son. And that one-time mistake upset his son's reason, and the two became greedy at any time and place, and even after his father finally returned from a business trip, he sought hard.