Tensei Kyaba Jou wa Moto Oji-san ^_-☆

Kurokome's hobby is visiting cabaret clubs. One day, he is shocked to find out that his entertainment expenses are not deductible. He thought it was just a dream, but then he finds himself a hostess himself!? The hidden side of his superiors, the unfunny jokes of customers, and sexual harassment... What he thought was a glamorous world is actually extremely tough! But he still aims to be number 1, and he will do his best as a hostess with a beautiful appearance and an old man's heart ★

(Source: Shogakukan, translated)