Marimo no Hana – Saikyou Butouha Shougakusei Densetsu

Baka description:

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.
Have fun!

Japanese raws:

chapter 47 here new
chapter 46 here
chapter 45 here
chapter 44 here

Other names:

まりもの花~最強武闘派小学生伝説~
守护之花~最强武斗派小学生传说~
Marimo no Hana