TLDR Sword Master childhood friend is a tsundere/yandere, on the shittier end of the tsundere spectrum. MC was actually talented in magic not swordsmanship, new mage girl is best girl but may be weird sniffing his cloak.
Demon king doesn’t seem very worth it, more so because you’re skipping 70 floors worth of rewards and treasures, as well as experience and power. He’s gonna get fucked on floor 99