Ai no Kusabi

A society on a distant star is governed by a computer system called Jupiter, which classifies men by hair color. The genetically modified Blondies, who live in the capital city Tanagura, form the highest class, while those with black hair, known as Mongrels, reside in the slums of Ceres. Iason, a leader among the Blondies, meets a Mongrel named Riki in Ceres one night and becomes determined to claim him.