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. The manga depicts a 12-year-old girl's innocent worries and first love.... more>>

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The name of the series is 12-sai (only). Even though every volume has a subtitle, they are all the same series:

12-sai Vol. 01 - Kokuhaku (Confession)

12-sai Vol. 02 - Boyfriend

12-sai Vol. 03 - Hajimari (Beggining)

12-sai Vol. 04 - Kokoro (Heart)

12-sai Vol. 05 - Yakusoku (Promise)

12-sai Vol. 06 - Uwasa (Rumour)

12-sai Vol. 07 - Tomadoi (Lost)

12-sai Vol. 08 - Hatsukoi (First Love)

12-sai Vol. 09 - Mirai (Future)

12-sai Vol. 10 - Himitsu . Himitsu (Secret . Secret)

12-sai Vol. 10.5 (Official Fan Book)

12-sai Vol. 11 - Kataomoi (Unrequited Love)

12-sai Vol. 12 - Inori (Prayer)

12-sai Vol. 13 - Tokubetsu (Special)

12-sai Vol. 14 - Sakamichi

12-sai Vol. 15 - Takara Mono

12-sai Vol. 16 - Koinokisetsu <<less

Sasami is the type of girl who gets easily pushed around at school. One day, a rambunctious young boy named Kou causes trouble in school and unknowingly drops a strange piece of candy. Sasami returns it to him and he suddenly asks her to marry him! Will Sasami accept his proposal or will she completely reject it? ... more>>

Volume contains: main story (chapters 1-3) + 3 oneshots <<less