The story centers around Erika Shinohara, a vain 16-year-old girl who tells her friends about her romantic exploits, but she actually has no boyfriend. She claims that a handsome boy in a candid photo is her boyfriend, but it turns out that boy is a schoolmate named Kyouya Sata. She has no choice but to make him her fake boyfriend. Unfortunately, Sata may look like a sweet person, but he is actually an ultra-black-hearted sadist. Sata takes advantage of Erika’s weakness and treats her like his dog.
When she was a middle school student, Yoshioka Futaba liked Tanaka Kou who was unlike the other boys and quite gentle. Kou then moved away and they lost contact.At the end of Futaba’s first year as a high school student she meets Kou again. Kou’s name has changed to Mabuchi Kou and his personality seems different from his middle school days.