Is Otome Nadeshiko Koi Techou hentai?
No
Rated G (All Ages) on MyAnimeList and not tagged as Hentai.

OVA · 2012 · 1 episodes · G - All Ages
Historical, Shoujo
The story follows a 16-year-old girl who is experiencing her first love during Japan's Taishou period (1912-1926). Bundled with special versions of Otome Nadeshiko Love Diary 2 light novel. (Source: ANN)
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