Domestic na Kanojo

A high school student named Natsuo is infatuated with his cheerful and well-liked teacher, Hina. At a mixer, he meets a sullen girl named Rui and has a one-night encounter with her. Shortly after, Natsuo's father announces his upcoming remarriage to a woman with two daughters. To his shock, both Hina and Rui are among those who arrive with the new family. Natsuo's life takes an unexpected and chaotic turn as a result.