Is Koukaku Kidoutai Arise [.jp] hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

Special · 2013 · 1 episodes · R - 17+ (violence & profanity)
Action
A short about the move of the kokaku-jprs website from '.com' to '.jp' - promoting the Japan Registry Services (JPRS).
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