Ryuu is highly intelligent, and his dark past somehow connects him to the organization known as Pluto. After his parents died, Pluto took care of him. As a child, he was never permitted to socialize with others. He frequently saw his house as more of a prison than a home. Despite his cold personality, he remains friendly with the other members of Class Q and shares a special bond with Kyuu, who was the first person to understand him.
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