Nouso was a very old nation where the Triangles lived since tens of thousands of years ago. They lived peacefully like as other Triangles. However, as Nouso is located in a remote region, they could observe from a distance how other Triangle nations were conquered and dominated.
他国の侵略に怯える人々の絵(イラスト) 
Nouso is a small nation with few resources, so it was not attractive for the Rounds. Therefore, they put lower priority to conquer this tiny country.

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