Tsuma no Haha Sayuri
English title: Sayuri's Mother-in-Law
Japanese title: 妻の母さゆり
Type: OVA
Episodes: 2
Source: Visual novel
Genres: Hentai
Studios: Y.O.U.C
Producers: Digital Works
Duration: 27 min per ep
Rating: Rx - Hentai

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)