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Usually a trip from Konoha to Uzushiogakure will take around 3 days, but with the use of kamui, we arrive on the same day we left Konoha. No wonder Obito can move anywhere faster, this kamui ability is really overpowered.
Of course, my students were shocked by my ability, they knew I had mangekyou sharingan but they didn't know what kind of ability I possessed. I told them my abilities, which are to store, teleport, pass through objects, and absorb. Luckily, my eyes are eternal mangekyou sharingan so the usual 5 minutes active duration has been increased to 1 hour.
Uzushiogakure is a bit unique, this place didn't have daimyo because it was an island but bigger than Konoha, and the population is smaller than Konoha. Let's say Konoha has around 60,000 members and Uzumaki only has 10,000.
This island was protected by whirlpool, actually this whirlpool are natural but because of Uzumaki Fuinjutsu, they managed to make them bigger and indirectly prevent anyone from entering Uzushiogakure without their permission. Setsuna can easily bypass this whirlpool, but he wanted to come as a citizen there, so he went with his student to the border of Uzushiogakure.
Then he met with the Uzumaki guard. Setsuna told him his identity and that he wanted to meet with Uzukage. The reaction of the Uzumaki guard is very shocked, they know the name of Setsuna, someone who can beat Tobirama and Madara with ease. After that last tournament, many people got to know Setsuna's battle IQ was very high. He can even defeat his own clan leader in a very short time. So they welcome the Setsuna envoy and bring them to meet with Uzukage.
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This Uzukage is older than Hashirama, if he is not mistaken, Uzukage is the father-in-law of Hashirama. His name is Uzumaki Kikai, the father of Uzumaki Mito.
"Hi Uzukage, my name is Uchiha Setsuna, and this is my wife, Haruko Hyuga, and my student," said Setsuna. His student knows he will marry Haruko Hyuga because he told them before they went to Uzushiogakure.
"What wife? Isn't she Hyuga?" said Uzukage.
"Yeah, she is Hyuga, and she is the reason I came to Uzushiogakure, we wanted to request to become citizens of Uzushiogakure," replied Setsuna, and she looked at Uzukage with a begging look.
"No," denied Uzukage. He cannot bring the Hyuga problem to Uzushiogakure.
"Why?"
"Because it may cause a war," replied Uzukage. "Furthermore, you are from Uchiha, in here there are only the Uzumaki clan. This place is not like Konoha, where a clan lives in peace."
"I can become Uzumaki," said Setsuna. This answer makes Uzukage dumbfounded. "How?"
"You can choose anyone from the Uzumaki clan, and I will marry her." Luckily, luckily he had told Haruko his plan if not, Haruko might slap him here.
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Time Skip at night, they were given a place to sleep. There was an uproar within Uzumaki when Uzukage told Uzumaki elder about Setsuna's plan to marry Uzumaki. They know the power of sharingan and they also know Setsuna is the second or third strongest ninja in the world.
Some of the elders gave their support, and they also offered their daughter to marry Setsuna. Well, they can't be blamed; they wanted their grandchild to become a stronger ninja. To cut a long story short, Uzukage proposes marriage to his granddaughter, who is the same age as Setsuna. Even though Haruko is more beautiful, this granddaughter is also beautiful, Haruko gets 10 stars for beauty, and this granddaughter, Uzumaki Akari, gets 9.5 stars.
But before he agreed, he gave a condition, his son and granddaughter wouldn't join if there were any wars outside Uzumaki. They will only join if the enemy attacks the village, this is to make sure the Uchiha bloodline survives in Uzumaki. Then all the Uzumaki clan members agreed with Setsuna that only if Setsuna's grandchild has a son will they need to join a war when they become adults.
(A/N: No harem only two wives, next chapter is about Romantic relationship between Kagami and Chino)