Márcia Saotome lives with her sisters Kou and Shion in a mansion, jointly managing the family business while presenting themselves as ordinary school-attending teenagers. The wealthy Saotome sisters are viewed by outsiders as arrogant and superficial. Though they experience interpersonal conflicts in civilian life, especially with the Mishina sisters, Márcia and her siblings collaborate seamlessly when acting as heroes. They offer mutual defense and support during missions, maintaining a close relationship that extends to consistent backing in both their business operations and heroic duties.