Sensei no Ojikan: Dokidoki School Hours OVA
Japanese title: せんせいのお時間: Doki Doki School Hours
Type: OVA
Episodes: 7
Source: 4-koma manga
Genres: Comedy
Studios: J.C.Staff
Producers: Genco, King Records
Duration: 23 min per ep
Rating: PG-13 - Teens 13 or older

The series is centered on 27-year-old homeroom teacher Mika Suzuki (who only looks about half her age) and the eccentric and colorful students of her class.

(Source: Wikipedia)