When boys suddenly get into places where they've never been allowed before, some girls tend to get upset. So when the decision is made to merge the elite Yuihime Girls' Private Academy and the coeducational Kagamidai Private Academy, everyone wants to take extra care in avoiding trouble while bringing the two Privates together. Therefore, rather than just bringing the Kagamidai boys into the Yuihime girls' school all at once, a plan is concocted in which a group of test males will be inserted into the Girls' Private Academy first.