An inquiry on Amano Jyakus motivations

You're guess is as good as mine. Amano and Megumi in the manga were just as distant and cold toward the human race as they were in the anime. Well, maybe Amano more than Megumi, but still, the fact that Amano saved a baby from being killed in a car crash only to kill the baby anyway by tossing the baby into the ocean because the baby would have died anyway so its survival was never meant to be only shows how impersonal he is to humans and the trivial existences that they lead. Perhaps he is a bit egomaniacal in his motives for finding the Chojin. Maybe he thinks if he could defeat the Chojin in battle, he could force the Chojin to obey him, reshaping the three worlds to his own liking. That's basically why he attacked and killed Ozaki when he thought that Ozaki was the Chojin. He figured if he could beat him, he could control him. He is hoping that the Overfiend is just a myth because he likes the way things are. At the same, he is hoping that he is not because he doesn't want to look like a fool wasting 300 years of his existence on something that was never real to begin with. His sister is obviously only interested in beating her brother at finding the Chojin, and trying to have sex with him. She perhaps thinks that no one would be better in the sack the the so-called "God Above All Gods". Amano and Megumi believe in a better world, but they really don't care if it comes or not.