Yuka has already spent six months with her very first boyfriend, Mahiro. While they've been dating for half a year, they're so pure and chaste that they can't even hug each other without getting nervous! But for Yuka, there's more than nerves keeping her on edge—she has a secret desire that she's afraid to tell Mahiro. Deep beneath her sweet exterior, Yuka has a desire to be dominated! She wants her lover to take charge, tie her up, degrade her, and make her squirm from pleasure—and she's certain if Mahiro finds out, he'll find her disgusting. Except, that's not true!

With her submissive nature finally exposed, Yuka and Mahiro start on a new path to sexually explore one another and take their relationship to the next level. Will this bind them together forever, or will it be too intense for this vanilla couple?