Come to the World of Monsters and Get the Mantra at the Beginning!

On the earth in the parallel world, all living things mutated due to a disaster, and in this wave of mutation, human beings fell last... In several years of war, humans were defeated by mutated monsters and eventually had to hide underground. At this time, a group of extraterrestrial visitors carrying various abilities quietly arrived on this earth where mankind has been completely defeated. Because of their arrival, everything in the world will undergo new changes... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.