Splatoon Raiders is categorized as being developed in Japan.
That classification reflects Nintendo’s development structure. The game is credited primarily to Nintendo Entertainment Planning & Development, commonly abbreviated Nintendo EPD, Nintendo’s internal division responsible for many of its major first-party games. Nintendo is headquartered in Japan, and Raiders is listed among video games developed in Japan.
The classification describes development origin, not the game’s fictional setting. Raiders takes place on the Spirhalite Islands, a remote region in the far-future world of Splatoon. Its story and art may draw on many international influences, but those creative elements do not change the country category.
Japan is also central to Splatoon’s production history. The original Splatoon was developed by Nintendo and launched for Wii U in 2015, establishing the series’ colorful ink-based battles, idol groups, and post-apocalyptic marine setting. Raiders continues that franchise under Nintendo while expanding it into a story-focused spin-off.