it's like the Raiden Shogun scene here, except this one comes out of the stomach not from cleavage and bad memories from the past MC is very sad even though he is very overpowered
the official typesetting on page 16 where nifl goes "treasury no.?" is so pretty compared to the fan standard typesetting that it makes everything else look cheap in comparison.
"This's" and "what're" are both extremely common informal contractions in spoken English in both the UK, Australia, and North America. Since they're used in dialogue here they're absolutely valid uses.