So... is 12-sai.: Chicchana Mune no Tokimeki finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 19, 2016
Manga finished: October 03, 2019
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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12-sai.: Chicchana Mune no Tokimeki
12歳。～ちっちゃなムネのトキメキ～
Anime - Base
Release date: April 04, 2016
12-sai.: Chicchana Mune no Tokimeki 2nd Season
12歳。～ちっちゃなムネのトキメキ～
Anime - Sequel
Release date: October 03, 2016
Synopsis
12-sai.: Chicchana Mune no Tokimeki focuses on two sixth-grade girls, Hanabi and Aoi, as they navigate the complexities of early adolescence and first love.
Hanabi, initially wary of boys, experiences a shift in her perspective when she begins to connect with a classmate named Takao.
Meanwhile, Aoi finds herself drawn to Kazuma after he defends her, leading her on her own journey of romantic discovery.
The anime explores the innocent and exciting feelings of first love and the challenges these young girls face as they transition from childhood to their teenage years. It depicts the blossoming relationships and the personal growth of Hanabi and Aoi as they experience these life-changing events alongside their friends.