@Grye Nope. Just a way to hide Yuna forgetting to pitch a kuma-tent to change kuma sides the first time around...
It is acutally the backstory for the who army of monsters' reason of gathering in one place.
i have to say, the anime is almost total different compared to manga version
except same character and some places, everything is different. not even the story.
okay, story is not 100% different but i would say its pretty much a rewrite rather than usual adapted-improvised-with-extras.
i put spoiler, incase noone want to see my opinion