In order to support his wife, who is approaching her due date, her mother-in-law, Marina, is coming to Tokyo from her wife's parents' house. Thanks to that, I have a good family relationship ... - However, if you can't allow yourself to get pleasure alone, you will be ordered to prohibit masturbation for the time being. A few days later, when she was masturbating in the bathroom, Marina slammed open the door. I was upset by the sudden situation, but Marina who knows the situation is sorry and asks if I can help. - She made a proposal that I didn't expect ...