Ya accidentally found the forbidden technique "The Art of Evolution" sealed by his ancestors. According to legend, it can make ninja dogs evolve and gain stronger power. In order to make himself stronger, Kiba used it regardless of the consequences to make Akamaru evolve into the guardian of hell - the flame head of the three-headed demon dog, giving Akamaru the ability to control the fire of hell. But the price is losing your mind. Regretful Ya used his life to awaken Akamaru's reason. After waking up, Akamaru turned into an energy body and entered Kiba's body to repair Kiba's damaged body in order to save Kiba. However, at this time, Kiba's soul had been burned to pieces by the fire of hell...
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