Shuichi is living alone until his wife Ayumi is released from the hospital after being hospitalized following an accident. The story begins when his mother-in-law Maya comes to take care of him. Maya's large bust is visible even when she is clothed, and her soft, voluptuous butt is so big it looks like it might burst out of her skirt. These are all things that Ayumi does not have. Exposed to the sex appeal that emanates from his mother-in-law, Shuichi makes a mistake with Maya in an attempt to escape from his life of abstinence...