Each volume depicts a different heroine.

[*] Vol. 1: Tachibana Tsubomi
Tells the story of Tsubomi Tachibana, a fifth grader dealing with issues such as her mother's pregnancy, her first period, and the strange feelings she has started to get when she has been around boys.

[*] Vol. 2: Kusakabe Tsubomi
Tells the story of Tsubomi Kusakabe, a fifth grader, who encounters an alien wanting to do research of earth. It turns out he has picked Tsubomi to be his research subject.

[*] Vol. 3: Shiina Tsubomi
[*] Vol. 4: Katanashi Tsubomi
[*] Vol. 5: Aizaki Tsubomi
[*] Vol. 6: Nike Tsubomi
[*] Vol. 7: Yagi Tsubomi
[*] Vol. 8: Honda Tsubomi

Won the Shogakukan Manga Award for children's manga in 2009.

(From: MU, MAL)