The story begins with Hanahi, 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.
12-Sai. 2nd Season
12-Sai: Chiccha na Mune no Tokimeki
12-Sai: Chiccha na Mune no Tokimeki 2