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Large-scale northward migration fueled by refugees fleeing pollution and natural disasters replenished Norinu’s dwindling population, spurring agricultural and industrial growth that made Norinu’s economy flourish. However, many pirates and bandits also joined the migration tide and mingled into the region.

In response, the Yamato government set up the Norinu Independent Division to counter piracy and banditry. Candidates must pass strict tests to join the division, which includes precision shooting, martial arts and mastery of diverse weapons while bearing the weight of heavy defensive armor. Top candidates will be selected to become Norinu Sentinels.

受環境污染及自然災害影響，民眾大量北遷，北伊努得到充沛的人力資源補充，令農業與工業迅猛發展，成為最發達的地區之一。導致周邊海盜、不法集團人員以經商名義，大量混入其中謀取利益。

大和政府為此特別設立北伊努獨立師團，從通過精準射擊和古武道近身戰鬥考核的佼佼者中，選拔出北伊努兵衛。他們在身著重型防禦裝甲的情況下，依然能嫻熟順暢地使用多種中近戰武器作戰。