Kodomo no Omocha
Japanese title: こどものおもちゃ OVA
Alternative titles: Child's Toy OVA, Kodocha OVA
Type: OVA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Dec 16, 1995
Duration: 30 min
Rating: PG - Children
Studios: J.C.Staff
Producers: Shueisha
Genres: Comedy, Drama
Themes: Love Polygon, School, Showbiz
Demographics: Shoujo

The Kodomo No Omocha OVA is a thirty-minute animation video that was made before the TV series. It covers the first volume of the manga, so it's equivalent to TV episodes 1-6. It relates Sana's troubles with Hayama at school as a result of the "oyakodon baka" situation and culminates when Hayama's dad and sister realize their mistakes thanks to Sana's efforts. 

(Source: AniDB)