Saori and Shigeo have been happily married for 27 years. The secret is that they have sex three times a week. Usually, they are careful about their son who lives with them, but on the weekends when their son is away, they have sex from morning until night! For a couple who have sex all day, marital discord is completely unrelated! But recently, they have been discussing... that once their son gets married and leaves home, they will be able to have sex every day! Wow, you two are really into that!