A returnee from the different world finally returns back to earth as he finds out that earth was invaded by monsters. The daily lives that revolve around a young man whom was taught on the way of fighting, battle and magic. Yet, had no idea on how common sense work....
Eyy, did you know at that time there was many trashy isekai novel on the front pages? The rankings is also filled with Xianxia, and at that time wuxiaworld didn't use karma or whatever currency they're using...