Is Ojisan to Marshmallow: Hige-san to Yume Mashmallow hentai?
English title: Ojisan and Marshmallow Episode 13: Hige-san and Marshmallow
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
Adult Cast, Comedy, Love Status Quo, Romance, Workplace
Habahiro Hige awakens at his desk at work, but much to his surprise, he has become a baby! To make things stranger, Iori Wakabayashi walks in wearing a school uniform but doesn't recognize him as the baby. Upon being picked up and held by her, Hige discovers that he doesn't just have the body of a baby but the mind of one as well. [Written by MAL Rewrite]
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