Is Mizuiro Jidai hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 1996 · 47 episodes · PG-13 - Teens 13 or older
Drama, Romance, School, Shoujo
Yuuko is a shy middle school girl who has feelings for her childhood friend, the boy next door. When she finds out that her best friend also likes him, she is unsure what to do. The story explores the relationships between these three characters as they confront everyday junior high problems. (Source: ANN)
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