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.
12-sai.: Chicchana Mune no Tokimeki 2nd Season is finished and has 12 Episodes. It is also Known as: 12歳。～ちっちゃなムネのトキメキ～, Age 12., Juuni-sai.
Genres: School Life, Romance, Friendship
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