...
"Turkey and Japan used to be in the same group in Asia when they were young, until Japan moved east and Turkey moved west."
If I am correct, Himaruya is talking about the Göktürks.
History ramble under cut
[[MORE]]
The Göktürks were a nomadic empire of Turkic tribes that lasted from 552 - 744

(early years)
My reasoning behind this
-Quoting once more “Turkey and Japan used to be in the same group in Asia when they were young, until Japan moved east and Turkey moved west.” We can go straight over to 581 when arguments came about over who should lead the Göktürks after the death of Taspar Qughan* which had occured that same year. These arguments lead up to a civil war between a western Göktürks and an eastern Göktürks. Taspar Qughan had willed it that Ahina Daluobian was to gain power over the empire at his death. High officials did not agree with this choice and made Ishbara Qughan the leader of the Göktürks instead. Added on with how many others started to use Taspasr’s death as a way to gaining power over the empire**. The best example I know of is Tardu***, a ambitious and violent man who had been planning to gain power before Taspar’s death. During the civil war Tardu lead the western empire while Ishbara lead the Eastern empire. This would be an explanation for how Turkey and Japan knew each other as kids but moved over to different sides of Asia.

(West and East Göktürks. lighter areas are directly controlled meanwhile darker lines are spear of influence.)
Japan - “After being discovered by China as a small child, Japan was raised by him” The Chinese essentially played off both sides of Göktürks. They helped the East get rid of Tardu****, but afterwards set out attacks conquer East Göktürks. When Japan was discovered by China he could of have moved over to the Japanese isles.
Mongolia - After the conquest of East Göktürks, different Turkic empires such as Uyghur along the Mongolian steppes. Mongolia most likely moved on to being the Uyghur empire in 744*****

(Uyghur)
Turkey - “It’s mentioned that Cyprus technically belonged to Greece’s mother (Byzantine in this drama track), and that Turkey found her to be beautiful and with a great personality” Before it’s collapsed the remaining Göktürks empire decides to expanse more towards the west, as they expanded they made an alliance with the Byzantine empire to beat the Sassanian Persians. (How lovely, friendships being formed over kicking Persia’s ass.)
Also while fighting the Eastern side Chinese emperor Taizong of Tang also claims to be the true leader of the Göktürks for his quest for gaining all of the silk road, causing even more arguments******. Over time the West Göktürks broke into many groups and small tribes due to weak leaders and petty wars. One of these groups are the Oghuzs, which actually have clear correlation with the history of Turkey in how the founder of the Ottoman empire, Osman, was the hereditary leader of Kayi a nomadic Oghuz tribe move over to the western Anatolia away from the onslaught of the Mongol empire and stayed under the Seljuk empire until Osman created and expanded the Ottoman empire.
*** Notes: 
Taspar Qughan was the fourth Qughan (King) of Göktürks.
Most of these men did not get far or lost to the opposing side.
Tardu was the second Yabgu or for a modern equivalent, a state official.
Tardu attacked the Sui dynasty’s capital Chang’an for interfering, so of course they would fight back.
The Uyghar empire formed from people rebelling the East Göktürks concluding the very close time between the end of the Göktürks and the start of Uyghar.
The Göktürks had a lot of influence from the Chinese, Taspar was one of the few Qughans that in braced the Chinese traditions and religons.

"Turkey and Japan used to be in the same group in Asia when they were young, until Japan moved east and Turkey moved west."

If I am correct, Himaruya is talking about the Göktürks.

History ramble under cut

The Göktürks were a nomadic empire of Turkic tribes that lasted from 552 - 744

File:GökturksAD551-572.png

(early years)

My reasoning behind this

-Quoting once more “Turkey and Japan used to be in the same group in Asia when they were young, until Japan moved east and Turkey moved west.” We can go straight over to 581 when arguments came about over who should lead the Göktürks after the death of Taspar Qughan* which had occured that same year. These arguments lead up to a civil war between a western Göktürks and an eastern Göktürks. Taspar Qughan had willed it that Ahina Daluobian was to gain power over the empire at his death. High officials did not agree with this choice and made Ishbara Qughan the leader of the Göktürks instead. Added on with how many others started to use Taspasr’s death as a way to gaining power over the empire**. The best example I know of is Tardu***, a ambitious and violent man who had been planning to gain power before Taspar’s death. During the civil war Tardu lead the western empire while Ishbara lead the Eastern empire. This would be an explanation for how Turkey and Japan knew each other as kids but moved over to different sides of Asia.

File:Gokturkut.png

(West and East Göktürks. lighter areas are directly controlled meanwhile darker lines are spear of influence.)

Japan - “After being discovered by China as a small child, Japan was raised by him” The Chinese essentially played off both sides of Göktürks. They helped the East get rid of Tardu****, but afterwards set out attacks conquer East Göktürks. When Japan was discovered by China he could of have moved over to the Japanese isles.

Mongolia - After the conquest of East Göktürks, different Turkic empires such as Uyghur along the Mongolian steppes. Mongolia most likely moved on to being the Uyghur empire in 744*****

File:Uyghur Khaganate.png

(Uyghur)

Turkey - “It’s mentioned that Cyprus technically belonged to Greece’s mother (Byzantine in this drama track), and that Turkey found her to be beautiful and with a great personality” Before it’s collapsed the remaining Göktürks empire decides to expanse more towards the west, as they expanded they made an alliance with the Byzantine empire to beat the Sassanian Persians. (How lovely, friendships being formed over kicking Persia’s ass.)

Also while fighting the Eastern side Chinese emperor Taizong of Tang also claims to be the true leader of the Göktürks for his quest for gaining all of the silk road, causing even more arguments******. Over time the West Göktürks broke into many groups and small tribes due to weak leaders and petty wars. One of these groups are the Oghuzs, which actually have clear correlation with the history of Turkey in how the founder of the Ottoman empire, Osman, was the hereditary leader of Kayi a nomadic Oghuz tribe move over to the western Anatolia away from the onslaught of the Mongol empire and stayed under the Seljuk empire until Osman created and expanded the Ottoman empire.

*** Notes: 

  • Taspar Qughan was the fourth Qughan (King) of Göktürks.
  • Most of these men did not get far or lost to the opposing side.
  • Tardu was the second Yabgu or for a modern equivalent, a state official.
  • Tardu attacked the Sui dynasty’s capital Chang’an for interfering, so of course they would fight back.
  • The Uyghar empire formed from people rebelling the East Göktürks concluding the very close time between the end of the Göktürks and the start of Uyghar.
  • The Göktürks had a lot of influence from the Chinese, Taspar was one of the few Qughans that in braced the Chinese traditions and religons.
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