Is 12-sai. hentai?

OVA · 2014 · 8 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 manga depicts a 12-year-old girl's innocent worries and first love. (Source: ANN)