Well, we can say the same things about american superheroes fighting against aliens or other supervillains. Just replace the rising Sun with stripes and stars.
This worlds geography caused a different evolution. All mammals live on the northern continent while the southern continent only have reptiles. Maybe even the humans of the south came from north a long time ago.
Some chapters ago Frieren mentioned a demon child spared by Himmel but had to be killed later. Demons don't born from love, they just spawn from darkness.
@Syanalassa Thx, at least your version makes sense (the plot still seems dumb). As for "kensei", in a European-fantasy setting it can be translated as sword master.
MC didnt try to change the situation, she makes the same mistake her character did in the game. If I was her, I would improve the relationship with the sister and prevent the sister to turn into a thot.
What bothered me about the translation was the "sake" with a picture of beer. I know it's the fault of the japanese, they call every alcoholic beverage as "sake".