She chose to travel, looking for Leo's brother, Sigma, after locating him Mio helped Sigma to look for ways to construct Idea, an ultimate Magouryu conceived by Sigma.
She chose to travel, looking for Leo's brother. This was what an ultimate Magouryu conceived by Sigma. Leo's brother was Sigma. She chose to travel, looking for Leo's brother, an ultimate Magouryu was locating him Mio helped Sigma to look for ways to construct Idea. Leo's brother was Sigma.