Giant World, Canberra Continent.
Several years ago, the World Government had designated this place as a "frontline military headquarters for operations against Otherworlds."
A Main Battle Legion of the military and an Auxiliary Corps composed of Otherworlders had been stationed here ever since.
A so-called Main Battle Legion—
Was a large force personally commanded by an Army Headquarters Admiral.
Each Main Battle Legion consisted of an admiral's direct division and five main battle divisions, with a total strength of around sixty thousand. The lowest rank among its regular soldiers was Second Lieutenant.
After five years of warfare and grueling training—
They had fully adopted Breathing Techniques from every school.
On that foundation, they could choose one among various supernatural Physical Arts, such as Hasshoken, Fish-Man Karate, and the Red-Leg Kicking Technique.
At the same time, everyone had more or less mastered one or two techniques from the Rokushiki. It could be said that their Physical Arts had become exceptionally well-rounded.
Any one of them would have qualified as an outstanding taijutsu ninja if placed in the Shinobi World.
On top of that, whether soldier or officer, they had exchanged the military merits they earned for all kinds of resources to strengthen themselves.
Some chose to become Kabaneri, or even the more advanced Nue. Others chose to exchange for Shingu from the Teigu World.
For example, the gauntlet-type Shattering King, which further granted its user Monstrous Strength.
Of course, the so-called "Monstrous Strength" had been redefined by the World Government as "enhanced explosive power in punches."
With the World Government's strong support and massive investment of resources, these Shingu could now be mass-produced steadily.
The rough process involved the Empire of the Teigu World, the Alchemi Kingdom, and Shenwa Island Country breeding low- and mid-level Danger Beasts to produce raw materials.