Feather Spear suddenly came to the surface from the center of the earth in an accident. While he was still walking alone in an unfamiliar environment, the place he was in had already undergone horrific changes...
Heavenly beasts, evil beasts, and giant dragons roam unimpeded, as well as the emergence of other non-human races, various super-ancient ruins, and what other unknown things are there in this world?
Okay [laughs evilly]