Ryuutarou is Rizumu's father and Sonata Amamiya's husband. He once aspired to become a superstar, a desire reflected in his current attire, but he had to quit due to Sonata's rising success. Instead, he became a housemaker. He remains deeply hurt by Sonata leaving the house at the story's beginning, and he protected his daughter at all costs to ensure she does not suffer the same trauma.
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