Protect the World Line

Due to the emergence of the alien Nanami in the human race, the world that used to be full of magic and secret tricks began to become different. The most obvious change is that everyone has become more disciplined when playing against each other. If you don't follow the rules, Nanami will come to tell you the rules. If you can't talk him down, you'll get beaten; if you can't talk him down, he'll go back and fuck you. Nanami's famous saying: If I can't beat the old one, I can't beat the young one!