Novelization of the series, with a new story settled after the ending. 
Released in a Complete Edition in march 2012.

22 years ago a mysterious seismic phenomenon rocked the Yokohama district, thrusting it miles into the sky and effectively separating it from the rest of Japan. In the following years, a fraction of the newborns in this fledgling world began to develop extraordinary powers, each unique to the personality of the possessor. These mutated humans became known as Alters and were responsible for turning the former Yokohama into a chaotic wasteland. Now, as the former metropolis continues to re-build itself, the Alters have fallen into two camps: those who have joined HOLY, a dogmatic organization that hopes to re-establish order and morality, and those who wish to lord over the comparatively weaker humans. Only Kazuma, a powerful Alter who's really only interested in looking out for himself and an orphan girl named Kanami, stands between them, suspicious of both sides and unaware that he may hold the key to harmonious co-existence. 
(Source: Tokyopop)

A strange environmental phenomenon 22 years ago in the Kanazawa prefecture caused the land to split and protrude upwards reaching unprecedented heights, creating the secluded area known as The Lost Ground. Kazuma is a young mercenary who lives in the Lost Ground, looking for any work he can find to sustain his livelihood within the harsh environment. He is one of the few people that are gifted with the Alter ability, which allows him to plaster his right arm and torso with a metallic alloy. When this mercenary encounters HOLY, an order whose purpose is to suppress and capture what they call Native Alter Users, and one of the elite members of HOLY, Ryuho, an epic rivalry begins. 
(Source: Anime News Network)

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