When the wife was away from home on a trip, she asked her mother to take care of her husband, and her mother-in-law, Erika, came to the house. - However, Ataru honestly could not welcome it. - For Ataru, Erika, with her bewitching charm, was not just a stepmother, but a woman. - Until now, Ataru had desperately suppressed and hidden his passion for Erika. - Living under the same roof with my mother-in-law. - Moreover, it is a perfect situation where my wife is not watching. - At last, Ataru's patience reaches its limit...