During my wife's absence, my mother-in-law, who came alone from Hamamatsu, where her family home is, to help with housework. My lively mother-in-law in her forties is caring and kind to my lonely wife! For a while, the two of them live alone and become aware of each other. The inevitable physical relationship between a forty-year-old mature woman with a graceful body and a mother-in-law who cannot refuse if asked begins!!