Seikai no Monshou (YONEMURA Kouichirou)

Adapted into the first volume of the Seikai Trilogy manga

Planet Martine is suddenly attacked! The alien invaders are known as the Abh. They are of human origin, but have been genetically modified so that each Abh has superior talent, skill, beauty, and longevity. Martine's president surrenders completely in the face of the Abh's awesome military power. Through a bizarre twist of fate, his son Jinto becomes a nobleman in the Abh's vast, intergalactic empire.