Ai no Kusabi - S01

In the future, on the planet Amoi, life is governed by a supercomputer called Jupiter. The human population is mostly male, with a privileged light-haired elite class permitted to keep dark-haired "mongrels" as temporary pets. Iason, a member of the elite, stumbles upon a mongrel named Riki in the slums and chooses to take him in. But when Iason keeps Riki far longer than socially acceptable, rumors begin to swirl about the nature of their relationship.