Kekkai Sensen

is a Japanese manga series written and illustrated by NIGHTOW Yasuhiro.

Plot
Three years ago, a gateway between Earth and the Beyond opened over the city of New York. In one terrible night, New York was destroyed and rebuilt, trapping New Yorkers and extradimensional creatures alike in an impenetrable bubble. Now, New York has been rechristened New Jerusalem, a paranormal melting pot where magic and madness dwell alongside the mundane, where every form of human vermin gathers to exploit otherworldly assets for earthly profit. Now someone is threatening to breach the bubble and release New Jerusalem’s horrors, but the mysterious superagents of Libra fight to prevent the unthinkable.

Official

 * Official Website

Other Sources

 * Wikipedia (English)
 * Wikipedia (Japanese)