Boys entering previously restricted territories can upset girls from time to time. In order to maintain peace, the Yuihime Girls' Private Academy and the coeducational Kagamidai Private Academy have decided to merge. However, rather than introducing all the boys at once, a group of test males will be gradually introduced into the Girls' Private Academy. Unfortunately, Shingo has been chosen as the first test male and thrown into the lion's den at Yuihime. The girls are less than thrilled about his presence. Will Shingo survive in the female-dominated environment of Yuihime? Will the girls learn to accept the boys? And, most importantly, how long until a panty incident triggers a war between the sexes?