To Fang Zheng, the moment he killed Tatsuya Shiba, his mission in this world was complete. If he wanted to leave, he could simply dust himself off and go. Unfortunately, Fang Zheng could not do that... Once the protagonist was eliminated, the world's course would undergo major changes. In other words, once the order built around the original protagonist vanished, Fang Zheng had to take responsibility for creating a new order...
Otherwise, if he left and this world's rules descended into chaos, it might become another breeding ground for Chaos... That would be even more troublesome.
As for what to do, Fang Zheng had already made plans.
He intended to follow the examples of Academy City and Kagami Island and establish a self-governing territory for Magi within Japan. As for the specifics, Fang Zheng planned to imitate Aleister: directly purchase a plot of land and turn it into an autonomous territory exclusively for Magi. He did not need to devise the rules from scratch, either. Whether it was Academy City, a training base for Espers, or Kagami Island, a self-governing territory for Magi, both had extensive experience in this regard. If Fang Zheng followed that path, his chances of success would not be small.
In fact, after returning to Japan, Fang Zheng had proposed his idea to Japan's government. Naturally, he framed it by saying that there were not enough talented Magi to begin with, and scattering students and teaching staff among nine separate high schools was an extremely foolish arrangement. It would be better to concentrate their resources in one place. Not only would that make management easier, it could also prevent another incident like the previous Nine Schools Competition.
Fang Zheng also stated that society's attitude toward Magi was deeply problematic. Leaving it unchecked would only create even