12-sai. is a oVA anime that premiered in spring 2014, produced by SynergySP.

About the production: the story comes from a manga, there are 12 episodes of about 14 minutes and its current status is "finished".

Its main genres are romance, with themes such as Shoujo.

On AniList, 12-sai. has an average score of 59%, an average score, and appears on 3,640 users' lists.

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: Anime News Network)

Official synopsis from AniList.