Is Getter Robo Arc hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2021 · 13 episodes · PG-13 - Teens 13 or older
Mecha, Sci-Fi, Shounen
Getter Robo Arc is the fifth Getter Robo series chronologically. Taking place several years after Getter Robo Go, Earth is now a post-apocalyptic world. Hayato, now an aging scientist, has completed Professor Saotome's masterpiece, Getter Robo Arc. Piloting it are Ryoma's son Takuma, the human-dinosaur Kamui, and the younger brother of Tayel, Baku. Alongside the reformed Dinosaur Empire, they fight the insectoid Andromeda Flow Country attacking from across time and space. (Source: MAL News)
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