When the decision is made to merge the elite Yuihime Girls' Private Academy and Kagamidai Boys Private Academy, everyone wants to take extra care in avoiding trouble while bringing the two together.

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. Thus, poor young Shingo finds himself being thrown as a sacrificial lamb to the lionesses of Yuihime, who aren't exactly waiting for him with open arms. Will Shingo manage to survive the estrogen soaked death pit that is Yuihime? Can the girls learn to be more receptive to the boys? And just how long until something involving panties will cause emotions to flare, sparks to fly and the battle of the sexes to explode?—Sentai Filmworks

The traditional girls-only Yuihime Private Academy is considering the possibility of starting to accept both genders and has thus made an agreement with a neighboring school to receive some of its students as an experiment to see the reaction to this adaptation. Shingo Iryu is one of the many students transferred for a ten month experimental phase at Yuihime Academy. He, his sister, and his fellow relocated colleagues are impressed by the sophisticated campus, but even more by the resistance of many students who don't want the boys over there.—Sentai Filmworks