Anta to Osananajimi tte dake demo Iya nanoni! Zekkou kara Hajimaru S-kyuu Bishoujo to no Gakuen Nariagari Seikatsu

Kazuma Suzuki was just your average high schooler—until his childhood friend, Rua Takayashiki, a beautiful, sharp-tongued girl who also happened to be the granddaughter of the school chairman and the nation's top idol, cut all ties with him using a line straight out of a drama. Forced into submission for years as her so-called childhood friend, Kazuma decides it's finally time for his first-ever rebellion. He's done playing lapdog. This time, he's taking back his freedom—and aiming for a normal school life. (Source: Square Enix, translated)