Ryūtarō Amamiya, husband to Sonata and father to Rizumu, once dreamt of music stardom, his flamboyant persona mirroring those ambitions. When Sonata Kanzaki—a legendary Prism Queen—became his wife, he set aside his career to nurture her rise, reinventing himself as a homemaker. Their life fractured when Sonata, wracked by guilt over his abandoned dreams and her failure to perfect the Aurora Rising Prism Jump, disappeared shortly after Rizumu’s birth.

For over a decade, Ryūtarō raised Rizumu alone, shielding her from her mother’s absence while steadfastly preserving his marriage vows. Fearing history’s repetition, he discouraged Rizumu from Prism Shows, protective to a fault—until her fierce dedication as a Prism Star softened his resolve.

Sonata’s return during the Prism Queen Cup rekindled fractured bonds. The couple reconciled, rebuilding their family with adopted daughter Kaname Chris. By *Dear My Future*, Ryūtarō and Sonata welcomed a second child, anchoring their renewed union. His journey—from faded ambitions to familial devotion—highlights quiet resilience, prioritizing love over limelight.

His name, blending "great dragon son" (Ryūtarō) and "heaven’s palace" (Amamiya), contrasts legacy’s grandeur with his earthy tenderness—a man who traded stage lights for steadfast nurture, finding fulfillment not in fame, but in reconciliation and home.