My First Friend

is episode 388 of the Naruto: Shippūden anime.

Summary
As Naruto executes his finishing blow, Hashirama uses his Wood Dragon to immobilise Madara, which also drains his chakra at the same time. With Naruto throwing his attack, the Shinobi Alliance march towards Madara's location. Sai then arrives and escorts Naruto. Meanwhile, Gaara asks Shukaku for its aid. Although initially refusing, Shukaku decides to join the battle, but only to prove that it is stronger than Kurama, rather than accepting Gaara's request. As the sand-manipulating duo prepare to head out, Son Gokū questions the young Kazekage if he is a friend of Naruto. Gaara then recalls his painful childhood as a jinchūriki, how the villagers shunned him, and his meeting with Naruto. Responding to the Four-Tails, Gaara says Naruto is his first friend. With that, he and all of the tailed beasts prepare to join the battlefield.