Irina Shirogane, besides being a lady of good and wealthy family, is also a mixed-race beauty, skilled in studies and sports, and the popular student council president. However, beneath all this, she harbors latent dirty impulses, and so, one day, while experimenting with self-bondage, she is surprised by Yuuji Sato, a suspicious and, by all accounts, terrifying-looking student. Convinced he wants to subdue and subjugate her, Irina trains to "face" him in a specially prepared room. And then the time comes for the final confrontation, and...