Class de Ichiban Kawaii Gal wo Ezuke Shiteiru Hanashi

A top student and reader model known for her glamorous style and popularity at school, and a quiet classmate who spends time with friends discussing otaku culture, are secretly step-siblings living together and in a relationship. Their classmates are unaware of their connection. While she maintains her bright, confident image at school, at home she is more relaxed and enjoys meals prepared by the other. He takes care of cooking and is happy to do so. The story follows their contrasting lives and the affection they share in private.