Is Ring of Gundam hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

Special · 2009 · 1 episodes · G - All Ages
Mecha, Sci-Fi, Space
The story of "Ring of Gundam" takes place in a new era long after the events of the first Mobile Suit Gundam series' One-Year War. In this world setting, a giant 600-kilometer-wide ring now floats in lunar orbit. An Earth Federation Forces member named Eiji discovers an object called "Beauty Memory" buried in a high-altitude, massive rockbed on Earth. (Source: ANN)
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