The main character of the anime. Despite having no wish or drive to be an Eternal Girl and being a complete beginner at the game she was chosen as a selector. Her reason for battling is simply for the thrill and excitement from it. Ruuko is very caring and thoughtful to the others around her to the point she was willing to lose her battle with Yazuki and Hitoe in order for their wishes to come true. Her LRIG is Tama.