Naisho no Tsubomi
English title: Naisho no Tsubomi
Japanese title: ないしょのつぼみ
Type: OVA
Episodes: 3
Source: Manga
Genres: Romance
Studios: Studio Kikan
Producers: Happinet Pictures
Duration: 27 min per ep
Rating: PG - Children

Tsubomi Tachibana is a fifth grader dealing with rather sensitive issues such as her mother's pregnancy, her first period and the strange feelings she has started to get when she has been around boys.

(Source: ANN)