3rd pov
The city has been destroyed including United States, but not for Japan. Thanks to Betty who started To Genocide. There was a boy named Kamio Hirohito the lasting survivor of the mass panic he lost his Entire friends including his family.

Kamio pov

I was crying because I lost my friends I couldn't stop crying about them thinking about what they hang out with.

Kamio (crying): Betty I thought we were friends, but now you killed them.

Unknowingly for myself that Betty is watching me

Betty: I guess I made him suffer *laugh*

As I was crying thinking about good days that we hang out
Kamio (crying): remember what we hang out with Night Raid, Jaegers, My friends, Asriel, Sans, Frisk, Akame, Tatsumi, Esdeath.
Betty (in shock): W-what?

Kamio (crying): That we met. I said as Betty Listen even more.
Kamio (crying): I thought we were friends.
Betty (thoughts): What have I done.

Then I started to see the visions of the death of  my friends, family, & being Betrayed by my best friend Betty. Then I felt my anger & my vengeance growing as I wiped my tears gritting my teeth as I stood up.

Kamio (angered): No. I won't forgive you for everything you done, Betty you betrayed me for what I need you most.

I said as She got horrified for what I've become.

Kamio (angered): I will have my revenge. I will go back to Japan to restart the Imperialism, this will end your Reign, Betty, you made me for what I've become, YOU HEAR ME BETTY! This Means War!

I said as I ran away from the Attack.

3rd pov

Overheard from her former friend have a message for her, Betty is in tears of regret and Kumu also felt sad for her that her friend is no longer befriended.

Back in Japan

It was attacked by Betty's Army then there was explosion reveal Kamio is using a weapon

Soldiers & Civilians were surprised that He fought back then he gave a speech.

Kamio: I have some news for you all, The United States has Fallen, but We'll not fall this time.

Then Soldiers overheard about it.
Kamio: It's time to start for our Imperialism, we will bring the Empire back.
They started to agreeing with him

Soldier: You're The New Emperor Now, Sir.

He nodded.

Kamio: Today, We will declare war on Monsters With human.
All: Yeah!
Kamio: Hoist The Colours!

The Crowd finally roared in loud.

Meanwhile in Kure, Hiroshima

Kure Naval Arsenal became Imperial Japanese Navy in-Hands.

They start to build the ships Including Greatest battleship ever use during Second World War: Japanese battleship Yamato & other Yamato-class battleships.

They made Japanese Combined Fleet ever since World War II but Now They are bringing it back to Start Imperialism  After the Few building the Naval Fleet. They hoisted the Flag, Japan Maritime Self-Defense Force is No More, There is Only The Imperial Japanese Navy.

In All of Japan Territory has Millions soldiers wearing World War II Uniforms.

They are ready to fight against the Enemies. Japan Ground Self-Defense Force is No More. There is only Imperial Japanese Army.

As for Kamio, he became The Emperor following the footsteps from his great grandfather. There be no peace there is only the War. Japan territory became The Empire. The War has found them, The Empire of Japan Declared war on Betty's Army / Betty's Empire.

The Empire of Japan has Returned.

End of Prologue