Disclaimer: I didn't own GATE

Author's note: I didn't intend to offend any Korean, Chinese or anyone by this fic. I have heard of all the massacre Imperial Japan did during WW2 but this is an alternate universe.

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Timeline

1905: Emerges as the victor of the Russo-Japanese war. Japan shifted its attention towards Korea, using the tactic of winning hearts and minds. Most Korean viewed Japan positively.

1907: Japan-Korean treaty of friendship and mutual assistance. The Empire of Japan annexed Korea. The annexation gone unopposed by the Korean military and civilians. No Soshi-kaimei act, Korean kept their names, cultures and tradition while operate as autonomous region in the Empire of Japan.

1910: Second Russo-Japanese War. In attempts to regain their lost territory, the Imperial Russian army invades Japan through Sakhalin island and the Ryukyus. The war lasted 4 months and end in a total Japanese victory as Japan had manage to decrypt Russian communication and thanks to the low morale of the Russian troops, they quickly collapse. Japan took the whole Sakhalin island. Russian Empire near the point of collapse.

1911: Fearing the the rise of militarism followed the victories of the Second Russo-Japanese war. Emperor Meiji announces change to Meiji constitution, removing Army and Navy from the senate. Though the IJA and IJN express resentment, they followed the order from their emperor.

1912: Emperor Meji passed away. Crown Prince Yoshihito became Emperor Taisho.

1914: 1st World War begins, Japan joined the Triple Entente and laid siege on the German port of Tsingtao. 12,000 Japanese troops are sent to France.

1916: Tsingtao garrison surrendered. Japanese troops in Europe is thrown into Battle of Somme.

1917: Japan took German Micronesia.

1918: Germany surrenders, Japan gain Tsingtao and Micronesia as rewards for its participation in the Battle of Somme. Japan didn't participate in the Russian revolution.

December 25th, 1926: Emperor Taisho passed away. Crown Prince Hirohito became Emperor Showa of Japan.

1929: The Great Depression. Japan was struck hard by the Economic Depression but they still manage to gone through it with minimum losses. Japan's growth rate shrinks by 9%.

1933: Rebellion of Manchus and Han Chinese in Manchuria, Chinese KMT troops open fire on Japanese troops patrolling the Yalu. In retaliation, Japan launches Operation Hachigo and invade Manchuria. Triggered the 2nd Sino-Japanese War. A perfect oppurtunity for Japan since Japan at the time is struggling to feed its population.

December, 1933: Chinese National Revolution Army attack Tsingtao harbor but were halted by the 12th Korean Infantry Division and IJN Naval gunnery. League of Nation attempts to force both sides to the negotiation table but both sides denied, calling it "a war for honor." Japan and China left the League of Nations. Germany and Italy, seeing the League completely powerless against Japan and China, start massive military expansion.

January, 1934: Japanese troops reached Yongding River in Peking. China negotiated peace, losing Manchuria to Japan. Japan formed the Empire of Manchukuo in Manchuria under the leadership of Emperor Aisin-Gioro Puyi of the late Qing Empire. The Manchukuan-Japanese treaty of friendship and mutual assistance was signed in March, allowing the Japanese to station the Kwangtung Army on Manchukuan soil. The Manchukuan Imperial Army was formed and Japanese advisors are sent to train them. A smaller state of Mengjiang is formed to the west of Manchukuo as buffer zones between the Republic of China and the Empire of Japan.

January 23rd, 1934: Aisin Gioro Puyi's coronation, he is now Emperor Kangde of the Manchukuo Empire. The League of Nation refused to accept Manchukuo as a nation.

April, 1934: Japan found Daqing oil fields. Along with Manchukuo's iron. Japan have enough resources to sustain economic growth and military expansion.

1935-1937: To protect Manchuria from China and the Soviet Union. Japan invested heavily on armored and mechanized warfare. German advisor are hired to train Japanese and Manchukuan soldiers and officers in the art of Mechanized Warfare.

January, 1938: Kure Naval Arsenal laid down the keel of IJN Yamato, after Japan's withdrawal from Washington Naval Treaty Japan used what remaining budget it had from the army and start massive naval and air expansion. Japan were to build three Yamato Class Battleship, four Atago Class Cruiser, two aircraft carriers and more Fubuki Class Destroyer. The IJNAS start experimenting on the new Mitsubishi A6M Zero fighter.

July 29th, 1938: Battle of Lake Khasan. The first battle between the Soviets and Japanese forces, it also marks as the first battle for the newly developed Type-1 Chi-He medium tanks.

August 11th, 1938: Battle of Lake Khasan ends in a total Japanese victory. The Red army suffers a mind blowing casualties of approximately 60,000 men and 120 tanks compared to the Japanese's 15,000 men and 40 tanks. The Chi-He is proven to be effective against BTs and T-26s but reports of Soviet's new tank called the T-34 and KV-1 worried the Japanese high command. The development of Type-3 Chi-Nu and Type-4 Chi-To started, along with upgrade for the Chi-Ha to carry a high velocity 47mm gun called the Shinhoto Chi-Ha. In the sky, Japanese Ki-27 totally dominate the sky against Soviet I-15 and I-16, they did found significant difficulty in fighting against Soviet aircrafts when the more heavily armed and armored version of I-16 were deployed to the frontline. But once the newly developed Ki-43 join the battle, the sky were firmly in Japanese hands.

September 1st, 1939: Germany invaded Poland, Second World War begins. Japan declared its neutrality. Germany soon steamrolled The Low Countries, France and poised to attack Britain.

March 23, 1940: A unknown gate appeared in Ginza, Japan...

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