On planet Amoi a great society has developed creating a computerized city called Tanagura ruled by supercomputer Jupiter The populace is almost entirely male and is based on hair color anyone silverblond are the elite with darkblack hair as the bottom of society often known as mongrels Blonds have pets which are usually young boys kept for a few years who are especially made for performing sexual actions for the Blonds voyeurism entertainment The pets are not supposed to be kept for long nor are Blonds allowed to interact sexually with them but one Blond named Iason Mink has kept a pet for years Mink is also rumored to sleep with his pet named Riki and refuses to let go of him despite Jupiters disapproval Riki fights with his emotions and society problems unable to decide what to do about his old friendlover Gai Guy and their gang Iason is obsessed with keeping Riki and Riki doesnt know what to do fight against him or surrender to him