It is something as instinctive as breathing, both a biological fact and common sense:
Ever since the universe came into being, conflict has filled the world without end.
All living things are divided into two opposing sides, each hostile to the other.
White and black, light and darkness, or good and evil.
What you call them doesn't matter. Only one thing is certain:
He and I are incompatible as fire and water!
Thus, the battle between the two sides lasts until death.
Standing upon an undeniable truth, everyone knows that an enemy must be killed on sight.
No matter who they are, if they belong to the other side, they must immediately fight to the death, even if they are their own parents, even if they are their own children!
After transmigrating to such a dangerous world, Siegfried decides to use the cheat that came with being a transmigrator to run off to another world and build up his strength first.
"What I did today was merely a temporary expedient!"
(Current world: History? What history? Later worlds planned: Honkai Impact 3rd, Type-Moon, When Marnie Was There, Puella Magi Madoka Magica, Shakugan no Shana, Marvel What If..., and The Misfit of Demon King Academy, among others.)
