Senior Brother Chu Zihang, how much regret do you have to bear before you can sleep well? Principal Angers, how heavy is it for you to carry a lifetime of hatred? If I give you a big hug, can you dilute your feelings a little bit? Sad? What about you, Eri? The story says that you are a witch-like girl. You must be very beautiful, the kind that can make me addicted to you. I really want to see you! ... A recurring nightmare about the future made Lu Mingfei hold his quilt and cry all night long. His sad tears seemed to drown the world. There are three thousand swords in the world, but regret is the most murderous. The tears that were more powerful than the rainstorm finally came to an end. The stagnant life of Lu Mingfei was poured out, and the cowardice hidden in his bones was wiped out. Swordsmanship, knowledge, strength... the boy will hold on to everything. The gates of Kassel are wide open, and the train of destiny is sounding its horn and heading towards the other side. This time the boy who slays the dragon is determined to raise his sword to protect his girl and cut off all regrets!