Natural: Another
English title: Teacher's Pet
Japanese title: ナチュラル Another
Type: OVA
Episodes: 2
Source: Visual novel
Genres: Hentai
Studios: Arms, Triple X
Producers: Green Bunny
Duration: 27 min per ep
Rating: Rx - Hentai

The story is about a young girl who falls in love with her teacher who was formally her sister's boyfriend. Although tension builds as he falls for another another female teacher and rumors of him and the student.

(Source: ANN)