18+ JK Haru wa Isekai de Shoufu ni Natta

Haru Koyama was an ordinary student until her moron classmate got them both in a terrible accident. Now Haru has been transported to another world where only men are allowed to be adventurers. Determined to make the most of it, she takes a job in the Blue Cat Nocturne brothel to make a living the only way she knows how. No cheat abilities, no powers, just her quick wits and naughty bits!

(Source: Seven Seas Entertainment)