Marimo no Hana: Saikyou Butouha Shougakusei Densetsu

まりもの花～最強武闘派小学生伝説～

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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: Anime News Network)