The twin sister of the Western Maiden. She is a school sports star, especially skilled in baseball. When Head takes a leave from the organization, Marino, under the name Manticore, is promoted to head of the Vanishing Age. She is devoted to keeping secret the fact that her sister Mizuno is the West Maiden; it is implied that this is her reason for joining the Glittering Crux Brigade. The Yō sisters grew up without parents as their father left them and her mother went after him leaving Marino and Mizuno alone. Marino has always resented her father because of what he did and because he left his family behind. She apparently has feelings for Takuto like her sister. She is the driver of Ayingott. It is revealed that she is the first phase of Mizuno and is just a clone made by Mizuno herself.