Marimo no Hana: Saikyou Butouha Shougakusei Densetsu
Genres: Action
Type: OVA, Episodes: 1
Aired: Mar 18, 2012
Studio: Kinema Citrus
Source: Manga
Rating: G - All Ages
Synopsis:
The story of the manga centers around Marimo Nogami, a usually quiet fourth-grade girl in elementary school. However, a certain incident leads to Marimo's personal strength blossoming. 

(Source: ANN)