Iinazuke ga Dekita to Omottara, Sono Iinazuke ga Gakkou de Yuumeina [Akuyaku Reijou] Dattan Dakedo, Dosureba Ii?

A high school sophomore, Hiroyuki Higashikujo, leads an uneventful life, free from romantic entanglements. One Saturday, his father informs him of an unexpected engagement. The situation escalates when he learns he must move in with his fiancée, a classmate known for her intelligence, beauty, and athleticism. She attends the same school and is described as the "villainess" by reputation. She asserts that Hiroyuki cannot refuse the arrangement, displaying a cold demeanor. The engagement disrupts his quiet routine, thrusting him into an unfamiliar and unwelcome situation.