A rivalry between two prideful and beautiful girls at an all-girls academy escalates into a romantic battle for dominance. The story centers on Kouben Akira, a super popular and elegant older sister figure at her elite school. Her rival, another stunning girl named Rui, challenges her directly ahead of the school's upcoming popularity vote for the title of Belle Fleur. Instead of a simple public contest, Rui proposes they settle things privately by entering into a secret relationship. Her declared aim is to prove that she is the one most worthy of being the school's top student by making Akira fall for her and completely submit. Thrown off guard by the proposition, Akira nonetheless accepts the challenge, determined to make Rui surrender instead. What begins as a strategic power struggle to see who can make the other yield first transforms into a secret, intense game of romantic and psychological maneuvers. Hidden from the rest of the school, the two girls exchange bold approaches and counterattacks, blurring the line between genuine affection and their fierce competitive drive. The original story is by Teren Mikami with character designs by Miman, and the manga is serialized in Shueisha's Dash X Comic.