Isekai no Yakusho de Arubaito Hajimemashita

A witch named Heliodor has come to the human world to accept applications for a part-time job at a public office in another world. There, she meets high school student Soushi, and immediately hires him. For Soushi, working in a place surrounded by unique characters like elves and those with animal ears is quite unusual, but while demonstrating incredible effort, he completes one task after another and gradually grows accustomed to the other world he's now in, all while creating his own harem. This is the beginning of a thrilling work fantasy in a world filled with true adventure! Source: Futabasha