NARUTO: Scroll of Lightning - The Beast that was Shot by Love!!

A manga-omake included with the Rai no Sho fanbook. It is set during the events of the Blank Period after the events of The Last: Naruto the Movie. The omake is unique as it is through Akamaru's point of view on his thoughts on master/partner Kiba Inuzuka.

(Source: Naruto Wiki)