Is 12-sai.: Chicchana Mune no Tokimeki 2nd Season hentai?
No
Rated PG (Children) on MyAnimeList and not tagged as Hentai.

TV · 2016 · 12 episodes · PG - Children
Romance, School, Shoujo
The story begins with Hanabi, a sixth-grade girl who is neither an adult nor a child. She deals with issues such as accidentally witnessing her homeroom teacher kissing, and worrying about experiencing physiological changes before her friends. The series depicts a 12-year-old girl's innocent worries and first love. (Source: ANN)
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