Is Marimo no Hana: Saikyou Butouha Shougakusei Densetsu hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

OVA · 2012 · 1 episodes · G - All Ages
Action, 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)
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