Mina and Riho are two close housewives. Mina's husband is a sports-loving dick-obsessed guy, while Riho's husband is a theoretician with an intellectual dick. They're both satisfied with their sex lives, but Riho suggests they try swapping husbands... And on the day of the swap, the four of them are at the peak of their sexual enthusiasm and engage in a serious swapping contest to see whose dick is the best! "My husband's dick is obviously better...!!"