Akane Soma is a widow and she lives with her daughter and son-in-law. Akane's son-in-law is a thoughtful and gallant person, he works in an office for a large company. The son-in-law is very concerned about Akane's mood and seems to understand his mother-in-law, while Akane's daughter is a carefree and childish person. She has not allowed her husband to have sex for many days and forced him to masturbate on the sofa. Suddenly, Akane's mother-in-law came down from upstairs and discovered her son-in-law watching sex and masturbating, making Akane also horny, hiding behind the wall and masturbating. Many embarrassing situations happened between mother and daughter and the end result was many incestuous and secret sex between the son-in-law and mother-in-law.