Each volume depicts a different heroine.
 
Volume 1: Main character of the story is Tachibana Tsubomi (立花つぼみ), 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. 
Volume 2: Main character of the story is Kusakabe Tsubomi (草壁つぼみ), 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. 
Volume 3: Shiina Tsubomi (椎名 つぼみ) 
Volume 4: Katanashi Tsubomi (小鳥遊 つぼみ) 
Volume 5: Aizaki Tsubomi (相崎 つぼみ) 
Volume 6: Nike Tsubomi (仁家 つぼみ) 
Volume 7: Yagi Tsubomi (八木 つぼみ) 
Volume 8: Honda Tsubomi (本田 つぼみ) 
 
Note: Won the Shogakukan Manga Award for children's manga in 2009.

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