Spoiler-Safe Summary

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Kiba struggles with feelings of inadequacy compared to Naruto's rise as a hero and commits to rigorous training to improve his skills. With encouragement and renewed determination sparked by a childhood memory, he overcomes initial setbacks and pushes himself to surpass his previous limits.

Full Plot Summary

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Kiba becomes upset that Naruto, the dead-last in their Academy days, has become such a hero. After being chided by his mother Tsume and partner Shino, he decides to train in order to become stronger. Kakashi Hatake happens upon Kiba and Akamaru training, where Kiba asks him to help him train, as he's the only jonin sensei available. Kakashi, however, simply summons his ninken to aid Kiba and Akamaru in their training. Initially giving up after being defeated by the hounds, Akamaru carries Kiba to a tree in the village, where he sees that Naruto had broken Kiba's record in speed since the time they were children racing for candy. With his determination renewed, he demands a rematch with the hounds and is successfully able to retrieve the scroll. With this, Kiba races to the tree and sets a new record, declaring that he'll never give up.