Toshiya’s twin imouto Rui is part of the student council at Alexandra girls’ school, a school for the nobility, and is highly admired by all students. Rui injured her leg in a training accident and wanted him to take her place until she heals completely. The student council officers (D’Artagnan, Athos, Aramis and Porthos), fondly called the “three musketeers”, are happy to see ‘Rui’ again. Will he be able to keep up this disguise until Rui returns? (Historical Background: The characters are (roughly) based on the historical novel The Three Musketeers from Alexandre Dumas.)