Kisaku Spirit
English name: Kisaku Spirit: The Letch Lives
Genres: Hentai
Type: OVA, Episodes: 3
Aired: May 28, 2004 to Jul 22, 2005
Studio: Himajin Planning
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
After Kisaku died, he had a strong desire that his spirit was still wandering around. Yuri noticed a guy who resembled Kisaku, but he was actully a hard worker named Kusaki, who had a good nature and was far different from Kisaku. When they first met, Kisaku's spirit appeared and started to haunt Kusaki. Eventually Kisaku took over Kusaki. 

(Source: AnimeNfo)