Which episode did naruto and nine tale become friends?

Naruto and the Nine-Tails, also known as Kurama, begin to develop a friendship in "Naruto: Shippuden" during the episode titled "The Fourth Great Ninja War." Specifically, their bond solidifies in Episode 381, when Naruto learns to communicate with Kurama and they work together to harness the beast's chakra. This marks a significant turning point in their relationship, transforming them from adversaries into allies.