Anime Crossover: Where Did This Sky Screen Come From?

My name is Wudi. I can't quite remember what my name was in my previous life. Ever since I was born on this land, my strength has been increasing every moment. I always believed that with this power, I could do anything, and so far, I always have. But what's going on? Where did the sky screen come from after I turned fifteen? What did it put up there?

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.