Joseito
English name: School Girl
Genres: Drama, Slice of Life
Type: OVA, Episodes: 1
Aired: Aug 1, 2006
Studio: Toei Animation
Source: Unknown
Rating: PG-13 - Teens 13 or older
Synopsis:
A sunny summer's day, the trembling insides of a girl are painted by Dazai Osamu's hidden masterpiece, "School Girl," a "Kaku Nime" production. Dazai's new literature taste is that of a person's challenge. The format of a girl talking to herself is presented by Motosaku, a Dazai Osamu fan as well; a girls of the modern day's heart also will resound as the finishing touches are applied to this work. 

(Source: AnimeNfo.com)