IJAC 2nd Battalion

"The IJAC 2nd Battalion, also known as Kappu's Battalion, has been a lower-ranking, yet prominent battalion that's also been led by Yamato Kappu. That's 15 men serving for the Imperial Japanese Army in this battalion. Also, they would've served for the Empire of Japan and its Emperor, Hirohito, since they fought against the Kuomintang in China during the Second Sino-Japanese War, which is also part of World War II."

--Su Ji-Hoon, Yamato's Memories

The IJAC 2nd Battalion, also known as Kappu's Battalion, is the lower army battalion of Yamato Kappu that he can lead his 15 teammates of who were Imperial Japanese Soldiers that they were serving for Empire of Japan and are fighting at Kuomintang in China from Second Simo-Japanese War.

And could be disbanded when Yamato Kappu's 14 teammates died (died by Chinese militias attack) to make him and his last teammate named Toshiro Fujiwara in Inkwell Isle by the support of King Dice.