Episodes: 12Status: Ongoing
Alternate Titles: Age 12., Juuni-sai., 12歳。～ちっちゃなムネのトキメキ～
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.