Tsuma no Haha Sayuri
English name: Sayuri's Mother-in-Law
Genres: Hentai
Type: OVA, Episodes: 2
Aired: Oct 21, 2011 to Feb 17, 2012
Studio: Y.O.U.C
Source: Visual novel
Rating: Rx - Hentai
Synopsis:
The main character is a white-collar worker. He has a wife, but she runs away from home. When he is at a loss what to do, Sayuri, his wife's mother, reaches out for him, "I'll replace her... Please..." As he lives with her, he gradually falls in love with her, and so does she...

(Source: VNDB)