Today marks the second anniversary of her relationship with Shizuku. Sae has been feeling excited since the morning and is looking forward to a party with Shizuku that night. However, that night, an Shizuku guest appears at their love nest... That guest is Sae's junior and Shizuku's ex-girlfriend, Nagomi. Meeting for the first time in a long time, the three reminisce about old times, but Sae does not know the true meaning behind Nagomi's appearance in front of the two. And the natural lesbian techniques that Nagomi was born with...