Chihaya works because the show doesn't pretend the crossdressing is a plot device. It's just the quiet fact of who he is now, and the real story happens in the spaces between, stolen glances in the dorm, the specific way Kaoruko moves through a room, the small betrayals of attraction he can't control. Three episodes is barely enough to breathe, but that constraint becomes the point. You're watching something that ends right when it starts to mean something, which somehow makes it mean more.
Set about two years after Mizuho's graduation, this romantic drama OVA centers on Chihaya Mikado, who has stopped attending his school because of harassment there and a distrust of men. Unable to stand seeing him suffer, his mother has him transfer to Seio Girl's School, where she once studied. Chihaya dresses as a girl and introduces himself as Chihaya Kisakinomiya. He meets Kaoruko Nanahara, who once saved him from a playboy, and moves into the dormitory. His good looks, his figure and his strong grades soon make him the center of attention at the school.