The 9 Lives manga

Alien refugees have come to Earth. They call themselves 9-Lives. Humans call them cat-boys, and force them to live as collared pets. Conri, a rebellious young 9-Life, ran away to escape this fate. But when a human named Adrian saves him from capture, Conri is torn between his desire for freedom and another desire he can't quite admit, even to himself... Can two people meet as equals in a world divided between masters and slaves?