Yukiteru Tamaki and his childhood friend Yuno Kirishima are in a relationship, and on the surface, everything appears perfect. However, Yukiteru harbors a secret: he has been sleeping with their mutual friend, Rena Saotome, ever since she confessed her feelings to him. Although Yukiteru intends to tell Yuno, he soon finds himself managing both girls, with Yuno remaining completely unaware. The situation grows more complicated when Kaori Yumeno witnesses Yukiteru and Saotome having sex on the rooftop. She agrees to keep quiet—for a price. That price, naturally, is Yukiteru's body. With all these girls in his life, Yukiteru certainly has no shortage of intimate partners. But what will happen when Yuno finds out?