Souten no Tobira

It's a world where science is worshiped. The privileged class concentrates all the money and power. With the genetic manipulation a creation of human beings has become possible. But these people are denied humanity and treated as toys to satisfy needs of the aristocrats. Main character is one such person who is created by a mad scientist and sold to a rich buyer. Is he doomed with this sad fate or can break free and find his Heavens?