The protagonists are two anthropomorphic field mice, and the series began in 1963 with the first volume Guri and Gura.

The stories tell of the encounters of twin anthropomorphic field mice, Guri and Gura.

[2] Yamawaki accompanies Nakagawa's loosely structured narratives with simple, unsophisticated illustrations.

[3] The first volume of the series, titled Guri and Gura, appeared in the children's magazine Kodomo no Tomo in 1963.

[3] Dozens of other translations have appeared, including Korean, French, Portuguese, Thai, and Esperanto.