Is Gundam Build Fighters: Battlogue hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

ONA · 2017 · 5 episodes · G - All Ages
Mecha, Sci-Fi
This is a dynamic dream battle featuring many types of Gunpla skirmishing in all sorts of situations. (Source: gundam.info)
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