Four childhood friends, two couples, and one VERY unsatisfied girlfriend star in this NTR-flavored romantic(?) comedy! Unlike their nympho besties Rin and Kyosuke, poor Yuna and her boyfriend Rikiya have been getting a little lost on their way to pound-town...well, at least one of them has. That's when Rin and Kyosuke, being the great friends they are, propose a solution—to swap partners for a day!