Mai Tokiha and her brother Takumi Have just transferred to the Fuka Academy, where a lot of strange things have been happening lately. They learn the existence of the HiME, girls with super-natural powers, capable of summoning powerful entities known as Children, it soon turns out that Mai is one of those HiME, although her powers have not fully awakened yet! However being a HiME is not as easy as it sounds, all this power comes with a steep price: there will come a time when the girls will not only have to put their lives on the line, but also whats most precious to them