Is Sweat Punch hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2002 · 5 episodes · R+ - Mild Nudity
Fantasy, Historical, Mecha
Sweat Punch is a series of five Studio 4°C shorts collected as a direct-to-DVD package film entitled Deep Imagination.
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