Kekkai Sensen (manga)

Blood Blockade Battlefront (血界戦線, 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 extradimentional 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 otherwordly 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.

History
The manga started as a oneshot published in Issue 2008-06 of Jump SQ. Later it became a 3 chapter mini-series published in the same magazine from Issue 2009-02 to 2009-04. In October 2009, it received a sequel chapter released in the Jump SQ.M vol.002 Issue. In the beginning of 2010, the 4 chapters were combined as Volume 1. In May 2010 the manga started serialization in the new magazine Jump SQ.19 which is released once each season (4 times per year). In 20120 the Jump SQ.19 magazine became bi-monthly and started to come out each 2nd month (6 times per year).