There are many littles stories in this manga !!!

Kakashi gaiden

It 's in fact the story og Kakashi childhood and the narration of how Kakashi achiev to receive his uncommun eye.

Naruto Next Generation

It' s the following adventures of the story of Naruto.

The Uchiwa family 's story.

During this little story we discover the tragedy of the Uchiwa story and of their dangerous powers.

There are plenty of other litlle stories for the manga which were create by the producters of the serie and which are just in cartoons and you can upload them on internet easily.