With the marriage of her daughter, Maki, mother Ai has finished raising her children. From now on, when I was about to enjoy my life, I was consulted about arbitration of marital relations. Hearing Maki's story doesn't get the point, so he ends up listening to his son-in-law, Shinichi, but... It is said that Shinichi was in love with his mother-in-law Ai. Shinichi can't stand his overflowing feelings and pushes him down, but Ai stops him. However, Ai's hand unconsciously goes to the crotch when she feels a tingle in her body when she touches the man's skin for the first time in a long time.