It originated in the Imperial Japanese Navy and was introduced as a dish for sailors because it was high in nutrition and well-balanced, and also because it was easy to supply the ingredients as they were the same as Navy curry.
大日本帝国海軍が発祥で、栄養価が高く、栄養バランスもよく、また海軍カレーと同じ素材を使うために補給の都合がよく、水兵の食事として全国的に導入された。