Is Shin Koihime†Musou: Live Revolution hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 1 episodes · PG-13 - Teens 13 or older
Ecchi, Idols (Female), Music
Shin Koihime†Musou characters sing theme songs on stage at a live event.
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