It was announced on the official Kekkai Sensen website that the final chapter of the series, number 12, titled " Hello, World ," will premiere on October 4th at 3:58 AM (Japanese time) and will last 46 minutes.
In addition, the staff announced the “ Kekkai Sensen ~Libra Nihon Shibu Welcome Party~ ” which will take place on October 4th Yomiuri Hall event in Tokyo .
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Kekkai Sensen (Blood Blockade Battlefront )
血界戦線
Kekkai Sensen is a manga by Yasuhiro Nightow , author of the classic Trigun , which began as a one-shot in 2008, before a serialized series in Jump SQ magazine in 2010 .
manga's story takes place in New York City, a rift has opened between Earth and the underworld, and creatures from another dimension are emerging from it . As if that weren't enough , the city is sealed off from the rest of the world by an bubble . And while humans and these other beings share the same space for years, someone has appeared wants to break that bubble, despite a group of superhumans trying to stop them .
Source: Kekkai Sensen Official Website