Married woman outdoor exposure

``When was the last time you had sex with your husband?'' Chihiro was consulting with her friend Mii. Mii, unable to see Chihiro, suggests that the four of them, including each other's husbands, go out together. A few days later...At a barbecue place blessed with good weather, Mii's husband Ryuichi steals Mii and her husband's attention and begins to play with Chihiro's body. Having sex with someone you shouldn't have in a place you shouldn't have. Chihiro felt something strange happening to her body. Later that day, Chihiro's cell phone rang...