12-sai.: Chicchana Mune no Tokimeki 2nd Season
Japanese title: 12歳。～ちっちゃなムネのトキメキ～
Alternative titles: Age 12., Juuni-sai.
Type: TV
Source: Manga
Episodes: 12
Status: Finished Airing
Aired: Oct 3, 2016 to Dec 19, 2016
Broadcast: Mondays at 19:30 (JST)
Duration: 24 min per ep
Rating: PG - Children
Studios: OLM
Producers: Shogakukan-Shueisha Productions, AT-X, Nippon Columbia, Warner Bros. Japan, Shogakukan, JR East Marketing & Communications, Sun TV
Genres: Romance
Themes: School
Demographics: 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)