The narrative revolves around a manga and visual novel game series known as Mashiroiro Symphony. It follows the story of an all-girls school that is about to merge with another nearby institution, resulting in them becoming co-ed. Prior to this merger, Uryuu Shingo was selected to be a male test student at the girls' school. Despite initial opposition from some female students, many of them have come to appreciate and enjoy Shingo's presence. However, Sena Airi, one of the main characters, remains hostile towards men in general and particularly towards Shingo. The story raises the possibility that her outright dislike may be concealing deeper emotions or feelings.