Is Sin: Nanatsu no Taizai Zange-roku Specials hentai?
English title: Seven Mortal Sins Specials
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2017 · 7 episodes · R+ - Mild Nudity
Ecchi, Fantasy
Unaired episodes 13 to 19 of Sin: Nanatsu no Taizai Zange-roku included on BD/DVD releases.
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