Rentarou is a second year student in Magata High School and also a Promoter in Tendou Civil Security. Rentarou's parents died in the war against Gastrea ten years ago, and was adopted by the Tendou family, but left the family along with Kisara. Rentarou lost his right leg, right arm and left eye in a fight with Gastrea to protect Kisara, and was saved by Sumire's "New Human Creation Plan" which replaced his lost limbs with Varanium. He uses an XD and is a beginner in Tendou style martial arts.