This is Naruto Shippuden movie 5 - The Blood Prison - part 2. If you're here by accident please watch Blood Prison, or read Blood Prison review part 1 first.
The next morning Naruto faces Mui in the courtyard again. He loses again and back to disciplinary cell he goes.
At night Ryuuzetsu determines to kill Mui, but when she faces him at his bed, she gets overcome by Maroi. She is confused, but later learns that he has a better plan.
Kazan appears at the prison, he asks to see his son. When he learns that The Truth does not keep promises he attacks. Just as quickly he is stopped and thrown in the ocean.
Maroi, Naruto and Ryuuzetsu conjure up a plan and the plan begins with a riot. Naruto starts it and pretty soon everyone fights creating enough diversion for Naruto to sneak out. He soon finds the gateway, but gets caught by the Truth faction.Mui released the Tenrou seal and started working on unleashing the Nine Tails. Naruto came to and seeing what is happening managed to get a smaller Rasengan going. He threw that at Mui but caused no damage. Naruto told Mui right off but saying that someone not being able to protect this gateway has no right to talk about future. Something happened, things were shaking and falling off shelves, then walls started crumbling and Naruto ran. Mui was faster as Naruto lost a lot of chakra and reactivated Tenrou on Naruto.
In the courtyard the gateway itself bursted from the underground. The Truth faction starred at it in bewilderment and called Mui to wish for the resurrection of Kusagakure. Mui surprised everyone when his only wish was to see his son Muku. He admitted that Kusagakure has been dead to him a long time. Hearing this the Truth faction attacked, but Kazan of the hundred faces defended Mui as he appeared as Mui's clone.
Muku walked out of this box unharmed. As Mui, his father started saying how sorry he was and how wrong he was, Muku pierced his heart with open hand. Then he killed Kazan who attacked. Then he looked at his father's corpse and said coolly: "Yes, you were wrong. Wrong to have released me from that box."
Ryuuzetsu started shouting at Muku telling him to go back to what he was before he was locked up. Something changed in Muku's eyes and he started screaming and transforming into this huge bird beast, while the box of paradise started sucking people in. Naruto having left his clone behind to gather enough of sage energy has now called up his clones already in Sage mode. Naruto explained that Natural energy comes from outside and therefore undetected by Tenrou seal. Jumping off of a roof with Oodama Rasengan Naruto attempted to break the box in hopes that Muku comes to his senses. Box would not break and Muku added that he tried escaping the box many times.
Naruto needed a monster to fight a monster so he called Summoning Jutsu and Geezer showed up. Geezer said that he remembers the box from era of the Sage of the Six Paths. Box produces a bird monster Satori and is destroyed by it. Also the people that it sucks in, turns to its allies, thus producing a strong and willing army. Muku cannot be turned back, he is a Satori now and he is on a rampage. This is the power of the Box of Paradise. There will be good wish come true. Just carnage and death.
Geezer attacked, but when Satori got out of the shot, Geezer continued to run, explaining that this is not a time to attack. They need a plan. Satori spots them and hurdles down on them when Geezer threw Naruto at it. Naruto signed a Mass Shadow Clone jutsu and attacked with massive multiple Rasengans. Satori stirred away and straight for Geezer. Geezer stopped Satori cold and measured up to him. Geezer opened his mouth and Naruto attacked again but Satori was again quick enough to slip away. Geezer advises Naruto not to think. This is a good idea if you're fighting a mind reading beast. 
Satori attacks again, Geezer gets thrown down and then thrown so far he reaches the blood prison. Geezer pulls out his Bokken, but Satori's read Geezer's every move. Naruto attacked but as he was signing his clones Tenrou seal reappeared on his chest and Naruto collapsed helplessly. Satori produced a red hot fire ball and threw it at Naruto. Having no skills or powers Naruto just stood there and would have died instantly if it weren't for Geezer throwing his own body into it and saving Naruto's life by blocking the blast with his own body.
At this point Eight Tails shows up with Killer Bee rapping as he "shows Satori who the king is". Lady Tsunade, Kakashi, Sakura, Tente, Choji, Neji, Kiba... the whole Hidden Leaf appeared. Tsunade explained that this was Naruto's test and no one ever doubted him for a second. This was his assignment and now that Satori is out it is done. Killer Bee will take over.
Satori dodges every hit that Eight Tails makes, takes humans along the way to throw them in the box. All of a sudden Ryuuzetsu jumped in front of Satori. Satori stood for a split second then left, but did not attack. Naruto noticed that Satori could not read her mind, hence her movements.
[GoogleAd]Naruto sat down and started getting into a Sage Mode. Everyone needs to pitch in and try to protect Naruto. Sakura jumped, but Satori dodged her punch. Rock Lee with Guy, then Yamato with his wooden jutsu and Kakashi. Tenten and Neji blocked spears that Satori shot towards them by using Kaiten, Choji got the Nikudan Hari Sensha going. Eight Tails kept on using his octopus arms to try to hit Satori, but Satori always got away. Ryuuzetsu signed Katon Oni Dourou (Demon Fire Lantern) but Tenrou lit her on fire. Everyone fought hard to buy some time as Naruto focused on getting into his Sage Mode. Naruto realized that he is no longer by himself, that he is just one of the whole village. It was then that he entered the Sage Mode and was ready to fight.
It was like Satori lost his sight. It could no longer see what's coming. Satori sat down on top of the box and started talking. How dark it was and how he grew angry until he became what he is, with death of his father, feeling nothing but fear. That is he can sense fear. Satori cannot read minds, but sense fear.
Naruto now in Sage Mode attacked and with success. Satori dropped down like a rotten apple. Naruto spoke angrily: "Don't you hear when people call your names? Can't you feel the pain all around you? Don't you have memories of comforting bowl of ramen? Can't you feel the need to protect someone?" Satori didn't share Naruto's views. To him feelings were merely used to control people. Naruto tried one last time saying that bonds between people need to be protected and cherished. "Mui, your father had that strength." At this point seeing that they met an impasse, Naruto signed his Shadow clones, Ryuuzetsu asked Satori to stop as he made a promise to her once. Satori rose and headed straight down to attack. Naruto signed Oodama Rasengan, but never got a chance to attack. Satori's claw ran both Ryuuzetsu and Naruto right through.
Ryuuzetsu and Naruto and she probably wanted to save Naruto by throwing her body in front of Naruto. Ryuuzetsu did not fear Satori and that is why he couldn't predict her moves. Naruto was hurt badly, but he noticed Mui's hand moving as as Mui was getting up Naruto clones attacked. Restraining Satori on the roof of one of the buildings, Mui gathered up his strength to sign Tenrou one last time and screamed: "let us at least die together son". Second later Satori was bound like a prisoner with Mui on top of him. Naruto and his clones attacked with Rasen Shuriken. This lit Satori on white blazing fire. 
Satori had turned to Muku. Muku recognized his father and Ryuuzetsu and just when it was clear that danger was gone Muku shot his father to pieces. Then signed Katon: Oni Dourou, the demon lantern he once practiced with Ryuuzetsu and lit himself on fire. Blazing hot he looked at Ryuuzetsu and said: I'm sorry I couldn't keep my promise, Ryuuzetsu." Then he shoot into the box and the gateway mouth closed.Prisoners quickly realized that the Tenrou seal was broken after Mui's death and started making a run for it. Choji, Shikamaru, Neji, Rock Lee... everyone helped to contain the chaos and bring the prisoners back in order. Next everyone stopped in bewilderment as the demon lantern covered the fields and started rising. Ryuuzetsu took this as Muku delivering on his promise and coming back.
Sakura is trying to heal Naruto but his wounds are too severe. Ryuuzetsu kneeled next to him and said: "I, Ryuuzetsu, hereby present my life." Then she signed Ruumei Tensei (Dragon Reincarnation) and turning white with bright glare she kissed Naruto on his lips.
It's up to Naruto to guide other people and make sure they're safe. Naruto takes his breath, then takes in Tsunade and describes the cold, dark, lonely place he just returned from. Then, he asks about Ryuuzetsu.