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The World's Will, namely Yggdrasil, the will of the world suddenly awoke from her slumber once more. The world was constantly changing, perhaps to the worse. Somehow, an entity she had believed to have been completely wiped out of the world after that big war… However, it was back. Indeed, an entity from the dimension of chaos, the dimensional planet, a Chaos Spirit!
"W-What is the meaning of this?! A Chaos Spirit has been sealed this entire time in this area of Jotunheim this entire time!? How could I never tell? Did it use some sort of power to- Ah, it camouflaged inside the corpse of a dragon?! Vile creatures!" The World's Will was a being that loved the world and those that protected it, dragons were the equivalent to the guardians of the world, and their ancient legacy still remains until now.
Check "The Protagnist's Sister Is Actually the Strongest"!