Welcome to the abyssal world of eros brought about by swapping!Mr. and Mrs. Akasaka are a middle-aged couple who have been married for 15 years.Both of them like it, and the one at Atchi is becoming more and more popular.The two of them saw an article in a weekly magazine, and decided to recruit partners for swapping.And the day has come to contact Mr. and Mrs. Ishikura, who are like-minded people, and carry out a couple exchange...!Neat kisses and sex between middle-aged couples are recorded!It is a book that I would like you to see by all means!