High school student, Takeru Kisaragi who had gained special physical abilities from the accident of his past, lives in a modern society without changing much though uncomfortable. However one day, a mysterious light engulfed the warehouse in his house, and the next thing he knew, he's in a world where "swords" which is used to amplify magic ruled the world. And a beautiful girl with a black hair and black eyes named herself as Sakuya.
"Floating on the altitude above 15,000 meters, the world's only floating city―Ether Float."
Elites from different nations gathered in one school, the Sealed Sword Academy, where the stage for peerless fantasy battles are unfold! Initiate!