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dankdevice
who are these characters?
Demon generals from each one of the ten demon armies, the right hand of the demon king and the demon king itself.
Having a war council before the Demon-Human Great War.
why should i care at all about them?
You're not supposed to do it. This is a flashforward several years on the future, right now they're just a bunch of randoms but when Kumo's story reach this point you will know most of them very well.
suddenly there's a demon king and 10 armies
Yes and a hero, elves, several human countries, two main religions and two main academies (one for humans and the other for demons). The manga's summary talk about the hero and demon king.
In times of peace each army have a zone where they protect cities against monsters, bandits and possible human invasions.
[ul]
Me: just a random person who discovered this manga years ago and got impatient for more and went to read the WN. There I found a bigger plot that combines more than 3 stories to tell a grand story that started with a spider trapped in a cave.[/ul]
[ul]
Demon king: The leader of the demons when a demon king dies the skill and stats system choose the next one giving it the tittle and skill (demon king), not much is known of the current demon king she just appeared one day with a mission, exterminate humanity. It's unknown where she was born, if she has family or who she really is.[/ul]
This chapter only purpose is show you how powerful and how much Kumo will change in the future. This change isn't going to be abrupt there's too much time before the main story reach this point, currently the manga is on LN volume 3 and today on volume 9 this point hasn't been reach yet.