Mother of Maria and creator of Sakutaro.
The most in need of the Ushiromiya gold. She is a single parent and lives alone with Maria. She is seen abusing Maria, but truthfully, she loves her. Such as fans asked why Rosa did not slap Maria when she was crying during the herd of Goat butlers. The reason is Rosa was put into both a survival and motherly tactics mode, and no urge to hit Maria came over her.