At the same time Sasuke was attacking Konoha, Naruto and Karin reached Kumo. Naruto knew that the Raikage and the Kumo ninjas were all brawn and no brains so he could not talk his way through so he could have just used a tailed beast bomb or a super shinra Tensei and blown up the village from the get go, but he wanted Karin to get some fighting experience. So both he and Karin entered the village wearing Akatsuki robes.
As planned, the Akatsuki robes caught the attention of Kumo ninjas and they were surrounded almost immediately. And to his surprise, instead of hiding the Jinchuriki, the Raikage came to confront him along with Killer bee the eight tailed Jinchuriki. This confirmed Naruto that Kumo was all brawn and no brain, but anyway nobody here could stop him if he wanted to get the Jinchuriki so all was good and it made his job easier.
The Raikage yelled "What's the akatsuki doing in my village after capturing our two tails? Have you come looking for death?" Naruto just shook his head "This is my partner and she needs some fighting experience. So who better to challenge rather than your whole village?" He said pointing to Karin. As Karin had not tails worth chakra of Kurama and already learnt sage mode and with the help of the seal created by Naruto, she could keep being in the sage mode and was close to the super Kage level. This Naruto had no worries about letting her fight the whole village and he was also present there to help her if needed.
Hearing Naruto saying that their village was full of training dummies made the Raikage seeth in anger and without a word, he was covered in Lightning chakra cloak and attacked Naruto. Before the Raikage attacked, the eight tails warned Killer bee that Naruto had Ninetails and before he could tell the info to the Raikage, he attacked Naruto. Naruto just stood there waiting for the Raikage to launch his attack and pointed a finger blocking the Raikage's punch. He then looked at Karin and spoke "Raikage only amounts to this strength. You may not have a good challenge here Karin".
Raikage was surprised seeing his deadly punch blocked by Naruto with just a finger and he retreated. As he heard Naruto's words, he was more angry, but he now knew the power of the person was way above him and took it seriously as to not attack blindly again. This time Killer Bee spoke "What is the Nine tails Jinchuriki such as yourself doing with the Akatsuki?" Every Kumo ninja who heard this were surprised. Naruto answered "As I said, I'm here for her to gain some experience in fights and also to capture the eight tails. If you surrender, I won't destroy your village".
Raikage and the Kumo ninjas visibly frowned hearing what Naruto said. Naruto didn't care about them and looked at Karin "Looks like they won't surrender Karin. You can take them on." Karin nodded and got ready to fight. She activated sage mode and the yin seal together. Her face got covered in black markings and she started to ooze out chakra. At this moment, she was looking scary for the Kumo ninjas. The Raikage saw this and took the opponents seriously and looked towards Killer bee. Bee also nodded and both of them coated themselves in Lightning chakra cloak and attacked Karin.
Karin also enhanced her hands and legs using Nature energy and blocked their attacks. She then punched the Raikage in the stomach so hard that he flew away several metres breaking several buildings on the way. Seeing their Raikage blown back, the Kumo Ninjas were a little scared to attack. But Bee was filled with anger and transformed into tailed beast mode two. Red chakra covered him and he looked like a beast.
With the chakra cloak, Bee was much stronger and he attacked Karin fiercely, only for her to block every attack. But she noticed that the attack started causing her skin to corrode. She then circulated the Ninetails chakra and her body was coated in a red chakra cloak with two fox ears on her head and one tail sticking from her back. This was the chakra of Ninetails that Naruto had shared and sealed inside her.
Eight tails inside bee seeing this commented "It's kyuubi chakra bee. Be careful. She will be much stronger now". Bee nodded and and attacked Karin only for her to kick him and he too flew back and landed on the Raikage who was starting to get up and both of them fell back again. Seeing this scene, the other Kumo Shinobi couldn't just stand by and they too started attacking. They used various Ninjutsu techniques, but Karin blocked or dodged them easily. She then started attacking the Kumo Shinobi.
At this time, the Raikage also got up along side Bee and both of them charged shouting "Double Lariat". Karin was distracted as she was fighting hundreds of Kumo Shinobi surrounding and jumping on her. Karin was soft and didn't kill the shinobis. Naruto seeing this scene shook his head and teleported next to Karin and extended his hands stopping the "Double lariat" by catching both of them by their neck. He then turned to Karin "Don't get distracted in the battle and don't show mercy to your enemies." Karin lowered her head because Naruto had to come to help her and nodded to him.
Naruto then made some distance from her throwing both the Raikage and bee. Karin then started fighting seriously with the attacking shinobis. The Raikage and bee also got up once again and charged, but this time, Karin was ready and blocked them. The fight continued and Bee transformed into full Biju mode. Seeing this, everyone except the Raikage stepped back. Karin did some hand signs and created a clone and she went towards the Raikage to attack him. The clone went towards bee.