Taisho's father plans to construct an apartment building on a vacant land he owns behind his own house. The spot is a playing field for the kids in the neighborhood who will fight to keep it as it is.

Source: ANN

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Prequel: Himitsu no Akko-chan 2
Sequel: Himitsu no Akko-chan: Umi da! Obake da!! Natsu Matsuri