Is Sono Hanabira ni Kuchizuke wo: Reo x Mai Diaries hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2009 · 10 episodes · PG-13 - Teens 13 or older
Comedy, Girls Love, School
Short picture episodes of Reo and Mai during their daily life as a couple.
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