Mashiroiro Symphony: The Color of Lovers

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.

Synopsis from Anime News Network