Shoujo Kakumei Utena: Adolescence Mokushiroku

Elegance is a way of life at Ohtori Academy. For close to one hundred years, the elite boarding school has valued tradition and ceremony above almost everything else.
Into this academic milieu walks Utena Tenjou, a short-stressed teenage girl who favors trim-cut boys' clothing. Almost immediately, she finds herself embroiled in sword duels, knotty romantic entanglements and a string of shady alliances. A cloud of mystery hangs over the campus of Ohtori, and everyone Utena meets harbors a dark and twisted secret.
(Source: Viz Media)