The flag comes in two variants, The Pre-War and The New Regime, both of the flag variants have their own backstory
The Pre-War (2097-2100)
The flag used before the Hino-Japanese war and during the war until the Unitary Republic of Hinora collapsed then replaced by the New Regime flag
The New Regime (2101-and so on)
The flag used after the collapse of the Unitary Republic of Hinora, The Rebellion flag (left) and The New Order of The Kanato Empire (right)
You can swap the flag name if you want to use it for other team