Just some history until now to get you the idea of how it got to the current state. Well, to get you the understanding of the start, you have to go back when the relationship between United States and Japan first began to decline.

In 1939, Japan annexed the Chinese province of Manchuria. The western powers did not like the disruption of the world peace after WWI. While Japan claimed that statement to be hypocrisy. Since the west has colonized most of the far east. And Japan believed that Asia should be ruled by Asians.

The League to Nations, equivalent of today's United Nations, concluded that Japan was the oppressor. And demanded to withdraw from Manchuria immediately. But Japan decided that if they leave the League of Nations, no nations were to interfere. And they were right. Manchuria was puppeted and were renamed Manchukuo. And this actions encouraged similar acts. Germany remilitarized Rhineland in 1936 and Italy invaded Abyssinia. No consequences were faced. And in order for the Japanese to build their empire, it was in desperate need for resources. And a giant target was right besides them: China. They were in middle of a civil war like any other parts of Chinese history. The war was raged on by the nationalist and the communists. And after the Marco Polo incident, Japan began the invasion of mainland China.

Japanese brutal occupation resulted in the deaths of hundreds of thousands. Incidents like the Nanjing Massacre continued to swamp the opinion against Japan by the west. But were not willing to get involved by force. France and England provided China with aids against the Japanese.

In 1940, France has capitulated by the Germans. And the balance of power in Europe changed.

And in effort of cut off supplies coming from the west, Japan invaded French-Indochina. And signed the tripartite pact. And basically gave Japan permission to invade Southeast Asia. This alarmed the US greatly. So in response, US hit Japan with a oil embargo. And because US supplied 80% of Japan's oil.

Japan was faced with a decision. With barely any oil supplies of its own, and less than 2 years worth of oil remaining, they either to withdraw its troops from the over seized territories, or to keep up the offensive. They looked at the Dutch East Indies were rich of oil. But to invade those lands would mean going to war with the United States. And it was what they chose. US president Roosevelt predicted this move. And ordered the Pacific fleets to move to the base in San Diego, at the Hawaiian island of Oahu, Pearl Harbor. Saying: "I have my eyes on you."

But that's all it did.

No one expected the war reaching Hawaii. Everybody thought that if a war between the United States and Japan would ever to break out, the Philippines would be the target. And Pearl Harbor had shallow waters. It was only 40 feet deep. And was thought that an aerial torpedo needed 70 feet to hit the enemy. But Japanese engineers came up with a new kind of aerial torpedo. Perfectly capable of working within these depth. The Japanese plan for an attack on Hawaii had been set in motion. The commander in chief of the Japanese navy, Isoruku Yamamoto knew the capability of the US. Having to lived in America. And he felt that a conflict between US and Japan was inevitable. So he planned accordingly.

It was that right after they declare war, they would attack the base in Hawaii and cripple the American Pacific Fleet. And right after, a massive blitzkrieg would take place. The Dutch East Indies, Malaya, Guam, the Philippines, and Hong Kong.

While all these were being planned, the Japanese had their ambassador negotiating in Washington D.C. That they would not invade any further than the Indochina. And in exchange the US will reopen the trades. But these talks failed. The US did not backed down against Japan's aggressive expansionism. But they did not know that the ambassador was only there to simply buy time. And later submitted a formal declaration of war. It was suppose to be submitted 30 minutes before the attack on Pearl Harbor. But due to miscalculation, it was submitted 2 hours after the attack.

And this story is starting when Yamamoto is planning for the attack.

November 18th, 1941

First Lieutenant Seiei Shuuya, a proud, and dedicated soldier of the Nippon Empire. He had a rich military family. Being able to trace back his family all the way back to samurai ancestors. And many of them fought in battles that plagued Japan's feudal history. His father served in the Russo-Japanese war and the Sino-Japanese war.

Seiei has a black, slightly messy black hair. When he was a child, he was born with a blond hair. But he dyed his color when he joined the army. He wore the Japanese navy uniform with a katana on his waist.

Seiei walked to his subordinates room. And my god, it was a mess. He opened the door to find his soldiers throwing pillows at each other. It was literally 12 in night. They should be sleeping. His soldiers immediately noticed Seiei. One of his subordinates Shouei Kyoto dropped his pillow. Do they have no shame? "Private, explain how this started." Seiei asked his men.

"Sir, we were fighting over who will kill the most Ame-co." he said. "And when did that started? You should have been asleep 2 hours ago." he added. "Around 10:30 sir." private responded. "So you were fighting for a hour and a half?" Seiei asked. But judging from the looks on their faces tells him that they did. "Go to sleep. There will be consequences tomorrow."

Note: Ame-co is an contemptuous and derogatory term for an American.

He closed the door. Only to be saluted by his fellow platoon leader, Itami Ryouji. He saluted back for a greeting. "The general is calling you." he said. "Alright. Also, if you don't mind, please watch out for my platoon. Those idiots might be doing something stupid again."

Seiei knocked on the general room door. "Come in." he opened the door. Saluting the general. "Lieutenant, I have to get straight to the point here." Seiei gulped. Is it about his stupid platoon? "You and you're platoon is tasked to protect his majesty tomorrow. Further information is here." general handed over a paper file with the sign: 機密情報 (Top secret).

Once he arrived at his room. He opened the file. Is it the Chinese spies? Gulping, he opened looked at the paper.

Empire of Sadera

At November 13th, 1941, a Roman like gate has suddenly appeared from nowhere in Kyushu. Though no sign of hostilities were catched. 2 days later in November 15th, a diplomat from an medieval empire called "Sadera" came. Wishing for alliance. In the current state of Nippon, she is in desperate need for resources. And the world beyond the gate has more than enough for the empire to keep up the offensive.

His majesty has decided to make alliance with the Empire of Sadera. And is going through the gate next week on November 23rd, 1941.

That was enough for him to understand what it is trying to say. But another world? An medieval empire across a Roman like gate? His common sense was doubting this file with all its might.

In the rest of the file, it is stated that the news of the gate is being suppressed by the government until the alliance is made. And that the government of Nippon is trying to negotiate that in exchange of giving technologies, the Saderans will give the government magics and resources.

Seiei sighed. "Am I dreaming?"

Pearl Harbor: 5 AM

Michael Gove checked his watch. Time for breakfast. He thought. He stood up from his table. Leaving his room.

"Good morning." he greeted people along the way. Lately, there has been rumors that the Japanese might attack them. But why Pearl Harbor? If the Japanese were to attack, they'll attack the Philippines first. Not Pearl Harbor. Saying this he always debunked the rumors. He has arrived at the cafeteria.

He sat on the chair, putting down his meal on the desk. Now being born in a Christian family and being a strict follower of Christ, praying before eating was important. So he quickly but sincerely prayed before grabbing for his food. But as he reached for his food, he saw the commanders arguing over something.

"Japan is going to attack us!" Commander Matthew said. "Confirmation? I don't believe stuff without any confirmation!" Commander Brajov bluffed the words. "If the Japs are going to attack, its going to be the Philippines." another commander said. "You believe in rumors so easily Matthew. You should calm down a bit. And realize that by doing that, the Japs are going to die." another commander said.

Michael sighed. As if they would do something stupid as that.

Tokyo

Emperor looked at the outside city through a window. He never knew technologies can advance this far. Especially after seeing their ships and those rod called 'guns.' He is staying in Tokyo until the negotiation next week. And getting exchanging these technologies for just magics and resources is a cheep trade. He smirked. These weapon will allow Sadera to conquer the world of Falmart. Perhaps he can use the gate in Alnus to invade another world in the future. While he can use this world to make alliances.

The empire had 3 gates. Dalnus (The one they used to connect to Japan), Alnus, and Balnus. Though when gate in Balnus opened, it connected to a mythical civilization that nearly wiped out all life in Falmart. It was a mercy of theirs to let a small numbers of each race live on to continue life on Falmart. So after civilization reformed, they blocked the gates of Balnus.

There is a military camp surrounding the gate. Molt read the news. Apparently there is a world wide war going on. That idea itself was crazy. But apparently this is the second time this happened. This country named "Germany" just defeated a nation called "France" and is using mind games to force another nation called "Britain" to sue for peace.

He further read the news to find out about the first global conflict. And he found the perfect one. It was a magazine called "The Great War." Molt smirked. "One helluva world."

November 23rd, 1941: Meeting between the Japanese empire and the Saderan Empire

Seiei looked at the news amount of news reporters. And it was understandable why there were so many people. After all, news of the gate have just been released last night. He rode the bike in front of the car the emperor is in. And he could see the Saderan emperor on a carriage.

Both emperors went inside the building as Seiei and his platoon guarded the outside. Stopping the walls of news reporters.

Emperor Hirohito greeted Molt. And they shook hands.

"First of all, as you heard, we will give you the technologies in exchange of your magics and resources." Hirohito declared. "First, I need to know, whether you are willing to influence my empire into submission to yours." Molt needed to make sure of that before making any deals. "Absolutely not, I am hoping for a future where both of our great nations can cooperate into utopia." Hirohito said.

The meeting went on for another 30 minutes until they both came to an agreement:

Japan will send guns and will teach how to use them.

Sadera will send resources that will be more than enough to run the empire as well as magic.

Japan and Sadera will cooperate in a situation of war.

And so, the new alliance was born.

White House:

"What!?" President Franklin D Roosevelt banged his table. "Mr President, the Japanese have made an alliance with a medieval empire in another world and now has an unbelievable amount of supplies on the way." Franklin sighed. Now the oil embargo is useless since Japan have enough resources without needing to conquer the Philippines. Well, since this will make the percentage of war between the United States and Japan very unlikely, it does not stop Japan's advance into China. And after hearing what the Japanese did in Nanking, Franklin have to stop that at all cost.

"What should we do? The delegate we sent in order to make a treaty with Sadera was denied entrance into Japan. We can't do anything. Our delegates will just be denied into entering Japan. And our sanctions against Japan are now useless." he said. The whole room went quiet. After all, what the president is saying is all true. And their abilities to stop the Japanese advance into China without interfering militarily is almost zero. And the public does not want to join the war unless they were attacked.

So this is what the Japanese government was feeling when they were sanctioned.

Japan

Admiral Yamamoto Isoroku was in a state of wonder. Waiting for a reply from the emperor. Since they now have oil, they don't have to attack the Philippines and go to war with the Japanese. So is the war with America plan scratched off the table? If so, that'll be good. He knew how winning the war against the US is unwinnable. Having to lived there, he knew the power of the United States.

"Admiral, the reply has came." his subordinates said as he gave the reply paper to him. Yamamoto grabbed the paper.

Yamamoto lowered the papers. "...Admiral..?" everyone is the room went silent.

"The plan... is resumed." everyone knew what this means. War. "The emperor feels that the war between US and Nippon is still inevitable. Well, that is understandable. If the army continues their invasion of China, the US will have no other option but to interfere militarily. But since now Nippon has the unimaginable amount of resources on the way, they could match the American industrial might. Meaning, this could be winnable.

So... my first fic in a while... I didn't have enough time to make this a long chapter since I'm currently busy with my real life stuff, but after that's done, I'll come back to this. So please be patient. Anyways, if you know anything I could fix in this fic, please tell me in the reviews. Also sorry for my bad English. Its not my first language.