Is Hyakka Ryouran: Samurai After hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2015 · 2 episodes · R+ - Mild Nudity
Ecchi, Harem
OVA bundled with Niθ Art Works Vol. 2, featuring a new character named Kagekatsu Uesugi.
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