Kakashi, My Eternal Rival!

In the Leaf village, while meeting with Tsunade about the impending war, Kakashi receives an emergency messenger tortoise from Guy with an SOS message, so he heads out to find out what has happened. On board the ship, Guy recalls the time he and Kakashi first became rivals and their numerous battles since then. Back on the ship bound for Lightning, the three jonin have a meeting, during which Yamato tells them about a rumor of a shinobi capable of not only copying someone's appearance, but also their chakra. Kakashi soon arrives at the ship and calls for Guy. Unaware that he had sent an SOS message, Guy comes to the conclusion that the one before him could be one of those imposters that Yamato spoke of. With this notion, Guy proceeds to attack Kakashi and later Aoba and Yamato when they side with Kakashi. After giving Guy irrefutable proof that he is who he said he is by telling him something from their youth, Kakashi returns to Konoha upon learning that the SOS tortoise was sent by accident.