Marimo no Hana: Saikyou Butouha Shougakusei Densetsu
Japanese title: まりもの花 ～最強武闘派小学生伝説～
Alternative titles: Marimo's blossom: The Legend of the Strongest Elementary School Fighter Student, Ribon Festa 2012, Ribbon Festa 2012
Type: OVA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Mar 18, 2012
Duration: 11 min
Rating: G - All Ages
Studios: Kinema Citrus
Producers: Shueisha
Genres: Action
Demographics: Shoujo

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)