"A fox sold me some gold pills that made me Faster, Better at controlling my Chakra and Made me Healthier." Naruto explained how he met Xu Dog

Naruto found a fox in the woods trapped in a bear trap. Freeing it and treating its wounds with his Medical cream Hinata gave him [the stuff from the Chunin exam] Naruto wakes up to find a bipedial fox man making pills in his kitchen.

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""No shame in taking pills. More unfair are the innate skills." He says handing Naruto a gold pill "On the house for saving my life."

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First Pill Naruto is standing infront of Budda and The Sage of Six, they were playing chess!

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Naruto wakes up and all his injuries are gone from his whole life.

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Xu Dog asks him to bring more supplies and Naruto spends his pay for missions on these pills.