人类自从诞生以来,便与千千万万种生物共生在一个蓝天之下,彼此结下了不解之缘。但在那茹毛饮血的时代,宁静的地球上竟也到处充满着杀机,因为人类也只有在与野兽的搏杀中获胜才能侥幸生存下来。人类毕竟是聪明的,从发明刀耕火种起,人们似乎便告别了为了生存而野蛮屠杀各种兽类的日子,尽管人类在与野兽的斗争中早已所向披靡。 Since the birth of human beings, they have been symbiotic with thousands of kinds of creatures under a blue sky, and they have forged bonds with each other. However, in the era of Naru’s blood-sucking, the serene earth was filled with murderous mobs everywhere, because mankind only survived by beating with beasts to win. After all, mankind is wise. From the slash and slashing of fire, people seem to bid farewell to the days of barbaric slaughter of various beasts in order to survive, even though mankind has long been invincible in the struggle with the beasts.