An old senile male alchemist / exorcist with a genius level intellect. Being immortal (or at least 1000 years old), he has acquired much knowledge of the supernatural. Unfortunately, he forgets something he already knows if he tries to learn something new, which leads to him constantly rereading his old books and manuscripts.    From  [Wikipedia](http://en.wikipedia.org/wiki/Ghost_Sweeper_Mikami)

You say you got a ghost in your prefecture? In Japan that means you need to call Ghost Sweeper Mikami, the paranormal detective agency that's a little abnormal. Okay, make that a LOT abnormal, but they DO specialize in disposing of things that most people don't even believe exist. Run by the visually delicious and even more avaricious Reiko Mikami, and aided by the very perverted (but also very loyal) Tadao Yokoshima, they'll take any case that pays. And Tadao will do anything that might let him sneak a peek at Reiko's magnificent physique. How unfortunate for him that Reiko basically sees him as cannon-fodder, something that's quite useful when your day to day business involves exorcising oni, yurei, yokai and anything else you might find in The Illustrated Bag of One Hundred Random Ghosts. 
 
(Source: Sentai Filmworks)

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_Note: Not to be confused with the [animator](https://anilist.co/staff/143678/)._

Overdevelopment and crowding in Japan has forced many of its indigenous spirits and ghosts to lose their homes. Due to problems caused by the homeless spirits, a new profession was created, the Ghost Sweepers (GS). Private exorcists for hire; they serve only the highest bidder to survive in the cutthroat corporate world. Among this, the Mikami GS Company, led by Reiko Mikami and her two assistants, the teenage boy Tadao Yokoshima and the ghost girl Okinu, is said to be the best. 
(Source: Wikipedia) 
Included one-shot: 
Volume 1: Gokuraku Mouja (Ghost Sweeping in the Haunted Mansion)

Dr.Chaos