SAN-chi Chokusou! Yami Baito

One day, Akari Kurono, a very poor high school girl surviving on plain pasta and tap water, applies for a high-paying part-time job at a dubious occult store. Together with the mysterious store manager, Amenpine, and his occult-loving co-worker, Koyo Meiji, they are determined to capture the "Dark Nui," horrifying entities that threaten the human world!

(Source: Houbunsha, translated)