Soshite Fumetsu no Regunare

Soshite Fumetsu no Regunare summary:

High school student, Kisaragi Takeru 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 alt.i.tude above 15,000 meters, the world’s only floating city―――Shinrei Fuyuu Toshi(Ether Float)”
Elites from different nations gathered in one school 『Fuuken Gakuen (Sealed Sword Academy)』 a school where the stage for peerless fantasy battles are unfold, Shidou!(Initiate!)