Jabarashi no Fukutsuu-san

Urabe, an exorcist known as "Mr. Stomachache" who suffers from stomachaches caused by spiritual disturbances, and his assistant, Kaname. The paranormal research center where the two awaits receives insidious and difficult cases that other places have given up on. A salaryman haunted by the ghost of his wife during divorce proceedings, a swimming instructor who became pregnant after working in the pool, a long-established inn with bizarre customs. To exorcise the deep-seated karma and desires of humanity, and the evil swirling within, Urabe and Kaname venture into the abyss.

(Source: Kadokawa, translated)