This comic is based on the eponymous game and serves as its official adaptation. The storyline centers around an all-girls school that is set to merge with a nearby institution, thereby transitioning to co-education. To facilitate the integration process, Uryuu Shingo is selected as a 'test student' to attend the school before the official merger begins next year.
On his first day at the school, Shingo discovers that many of the girls are not thrilled about the impending amalgamation. Specifically, Seno Airi is unwaveringly opposed to the idea and refuses to welcome him to the institution. While some of the other girls are friendly, Airi's dominant presence sets the tone for public opinion.
Interestingly, Shingo has met Airi before. When Airi and Shingo's younger sister got lost, he aided them in finding their way. Airi appeared to like him then, oblivious to the fact that he would later become her new male classmate. Perhaps, Shingo will win over Airi and his other intriguing female schoolmates.
