Ai no Kusabi - S01

The story takes place in the future on the planet Amoi, which is run by a supercomputer called Jupiter. In a mostly male population, the light-haired elite are allowed to keep the dark-haired "mongrels" as pets for a limited time. One elite, Iason, finds a mongrel named Riki in the slums and decides to take him in. But Iason keeps Riki longer than society allows, and rumors spread about what their relationship might be.