Everyone died in like 8 paragraphs, then his revenge; Dude wiped a country's capital, every soldier, nobles, man, and women with a single barrier spell in the next 5 paragraphs. exactly Vol 1 Chapter 19.
To be fair, the author wanted to justify him becoming a Great Demon Lord; but also to be fair to us readers, this was sold to us as "Barrier Master Isekai" not "Demon Lord whachamacallit."
Also, this is the last part of the latest chapter I could find, for comparison.
「It’s alright. I’ll be sure to teleport back every night. No need to worry」
「Every single night?」
「Of course. Every single night I’ll be there to embrace you」
「You must, you have to come back」
I hugged Rico close to myself and gently squeezed her buttcheek. Stimulated by my touch, she wiggled in delight as her breath turned hot and rough.
And so the night continued.
Notice the tonal disparity?
Then again, I don't know if this was due to the injection of the translator's own writing style.