A 700-year-old half vampire. He is the son of Count Bloodeau (pronounced "blood-o") who is said to be the "cousin of the husband of Count Dracula's sister". He is currently a disciple of Father Karasu, but knew Karasu years previously. He also goes to the same school as Yokoshima; and because of his handsome looks, he's very popular with many girls, including Emi Ogasawara. His big dream is to become an Occult G-Man one day.

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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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)

Pietro de Bloodeau