ぐりとぐら
([i]Guri to Gura[/i], Guri and Gura) 

Children's book series written by "Nakagawa Rieko":http://ja.wikipedia.org/wiki/%E4%B8%AD%E5%B7%9D%E6%9D%8E%E6%9E%9D%E5%AD%90 and illustrated by "Yamawaki Yuriko":http://ja.wikipedia.org/wiki/%E5%B1%B1%E8%84%87%E7%99%BE%E5%90%88%E5%AD%90 (the authors are sisters) 
The series focuses on [[mouse (animal)|mice]] [[twins]], [[guri_(guri_to_gura)|Guri]] who wears a blue [[hat]] and [[jumpsuit]], and [[gura_(guri_to_gura)|Gura]] who wears a red outfit.

h4.External links

* "Official page(Japanese)":http://www.fukuinkan.co.jp/ninkimono/gurigura/index.html
* "Google books":http://books.google.com/books/about/Guri_and_Gura.html?id=ENhYO93DsTQC
* "Amazon.com":http://www.amazon.com/dp/0804833524
guri to gura