Nontan is the protagonist of a Japanese series of children's picture books by the same name written by Sachiko Kiyono. 
In the series, Nontan is a mischievous kitten who likes to play and learns about the world around him. Other characters include Pig, Rabbit triplet, Raccoon, Bear, Bee, and Nontan's little sister Taatan. 
(Source: Wikipedia)

This 3D animated series for young children is based on the adventures of perky white kitten Non-tan. With his friends, fun-loving Tanuki, strong Bear, and the pink Rabbit triplets and his rival, Pig, he teaches children positive lessons about the beauty and wonder of life.
 
(Source: The Anime Encyclopedia)

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