When the food chain stabilizes and is acknowledged by people, it becomes a rule.
Cats eat fish, dogs eat meat, Ultraman fights monsters.
Doesn't that sound normal?
But anyone who knows cats understands that they originally lived in deserts. Before humans brought them to other regions, where could desert cats possibly find fish to eat?
The Human Race came to the Celestial Profound Realm, adding the 'Demon Race' rule to it, and thus this rule of liking fish was adopted by the Demon Race, much like a cat.
Perhaps after countless years, when the older generations who remember the Demon Race's origins have all passed, a new generation of the Demon Race will rise, and trading with the Human Race will become their norm. In the future, when the Demon Race of the Celestial Profound Realm becomes completely accustomed to certain things, maybe even the name Demon Race will be changed to Spirit Beast.
