The setting of this tale is in the universe of Mashiroiro Symphony's manga and visual novel game, where an all-girls school is set to merge with a nearby all-boys institution. The story revolves around Uryuu Shingo, a male "test student" who is drafted in to aid the girls' school with the transition process. At first, some of the female students are opposed to his presence, but Shingo manages to win them over gradually, including Sena Airi who was initially against him. However, the protagonist, Inui Sana, harbors a strong animosity towards men as a whole, and Shingo in particular. Yet, could there be more to her antipathy than meets the eye?
