Is Hai to Gensou no Grimgar: Furoagari no Kabe ni Kaketa Seishun - One More Centimeter hentai?
English title: Grimgar: Staking Our Youths on the Bath Wall - One More Centimeter
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2016 · 1 episodes · PG-13 - Teens 13 or older
Comedy
Special episode that will expand on the ending of episode 2 where the boys try to spy on the girls bathing.
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