Aoi taunts Idate. Only a horrible person would betray his own brother and then abandon his village.
The Konoha genin face their rain nin foes underneath the water when Naruto is pulled under and trapped. He Kage Bunshins and commands several of his clones to sink lower and start Rasengan below. Soon, Naruto has a mighty whirlpool brewing within the water and the clones are destroyed. He then grabs Sakura and swims to the water's surface.
Sasuke swims to shore while Naruto runs across the water's surface. He trips over a rock and he and Sakura are thrown to Nagi Island's beach area. Sakura pretends to be unconscious in hopes that Sasuke might give her mouth to mouth, but Naruto steps up for that job. When she peaks out and sees Naruto's lips inching closer to her, she abruptly awakens and punches him hard.
Aoi has Idate trapped in his rain prison. By now Fusuku has reached the shrine, while Aoi's rain drains all Idate's energy. When Idate reaches for his coveted knife, Aoi stomps on his hand and then repeatedly beats him.
Naruto and co. arrive shortly after to take on the Rain Leader. He pounds them with his downpour and explains that the toxic rain venom will soon prove fatal. From the distance, they hear cheering and realize Fukusuke reached the shrine. Luckily, Fukusuke is quite cocky and takes a long break there while Sakura hands each of her team one of the pills Tsunade gave her. They are rejuvenated.
Idate remembers showing his brother the Konoha forehead protector he finally received on the day he became a genin. He wanted to become a ninja like his brother, but his sensei was Aoi.
Several years ago Idate failed the Chuunin exam and was deeply distressed. When Aoi told him he could become Chuunin without passing the exam, he jumped at the opportunity. He stole the seal scroll and the Second's Raijin sword for his sensei was left with little choice but to leave Konoha for the village of Rain with Aoi.
After that, he felt he couldn't do anything right. But Boss Jirochu believed him when no one else did. Naruto reminisces back to when he failed the genin exam and understands that Idate is like him. He then exclaims that one person believes in him - isn't that enough? The race isn't over yet and Naruto will even carry him if he can't run. If he fails here, he will be a loser for the rest of his life.
Naruto picks up Idate and the two head to the shrine.