Why did the Astral Apostles stop?

Because it's off the shelf. The Astral Apostle is a science fiction novel, which mainly tells the story that in the interstellar era, people's territory has expanded to the whole space, and Zhou Jing, a man, was abandoned by his family because he made no contribution to his family. I can't see it because it's off the shelf, because the content is too violent, and it's also for the health of teenagers.