Rewriting the World Line Starting from Entering Kassel

"When you were the most lonely and desperate, did you ever imagine that a door would open next to you?" Li Qiye never thought that his peaceful life would end completely when he turned eighteen. A red-haired girl fell from the sky, a heartless senior student, and a college named Cassel revealed another side of the world to him. Word spirits, alchemy, dragon slayers, in the gap between myth and reality, the black throne is crumbling, and the young man who does not believe in fate has a sword in his hand. "So, be as wild as you want, and don't let down this passionate youth that can't be regained."