Ai no Kusabi Vol. 1: Stranger

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In the future, on a distant star lives a new society. Ruled by a computer system named Jupiter, men are divided into classes based on their hair color. The Blondies, genetically altered by Jupiter, are the highest class and occupy the capital city of Tanagura. Those with black hair, Mongrels, are forced to live in the slums, Ceres. Iason, the leader of the Blondies, encounters Riki, a mongrel, in the streets of Ceres one night and sets out to own him.

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Taken from back cover:

The Man's upturned blue eyes were so unimaginably beautiful that they could make anybody tremble with awe. In this moment, however, they also glimmered with an icy fire--perhaps revealing the fury of his wounded pride, or rather, a manifestation of his uncontrollable obsession.

Ceres: a city without ethics or taboos, ruled by instincts and lusts. These are the slums--immutable, eternal, home to those poor, caged souls stricken with a perpetual melancholy.

After three years, Riki unexpectedly returns to Ceres, but all is not well. The "Charisma" of the slums is a changed man. Faced with growing suspicion that he's lost his spark, and haunted by the memory of what happened during those three years away from the slums, Riki finds himself pulled into the escalating gang warfare as rivals attempt to wipe out his pack before they can regroup under their newly-returned leader. And then there is the frighteningly cold, regrettably familiar man he meets by chance one day: the beautiful Iason Mink. What secrets lie behind the smile of that bewitching Blondy?