Ai no Kusabi (2012)

The action takes place in the far future on the planet Amoi, governed by Jupiter, a supercomputer. The light-haired aristocratic class is permitted to temporarily own the dark-haired "mongrels" as pets among the primarily male human population. Iason, one of the top members, decides to adopt Riki after running into him as a stray in the slums. Iason, however, retains Riki for a longer period of time than is customary, and speculations about their potential connection are rampant.