Shirakiin Ririchiyo is rendered as a poised and elegant figure, smiling with a composed, chilly gaze that hints at her sharp wit. The Premium Prize presentation emphasizes her dark, Gothic-inspired attire, a flowing dress sculpted with fine folds and lace accents, and subtle crimson highlights that trace the edges of her collar and sash. Her long, glossy black hair cascades down her back with individual strands picked out by painterly shading, and a hint of red accessory at the crown adds a striking focal point. The figure captures her slender silhouette and dignified poise, standing with one hand at her side and the other slightly raised, conveying both her fragile sweetness and stubborn resolve. The finish emphasizes delicate skin tones, crisp linework, and a glossy eye that conveys intelligence and resolve, making the character instantly recognizable to fans of Inu x Boku SS.

Inu x Boku SS follows Shirakiin Ririchiyo, a headstrong heiress who winds up living at the luxurious Moon River Estate alongside the mysterious and powerful ayakashi who serve as her Secret Service detail. Ririchiyo strives to shed the arrogance of her aristocratic upbringing while learning to trust those around her, especially her loyal familiar, Soushi Miketsukami. Across the series, she battles personal insecurities, guards her fragile heart, and navigates perilous intrigues that threaten her family and the fragile peace of the mansion. Her interactions reveal a budding bond with Miketsukami, filled with hesitant hope, mutual protection, and gradual admission of deep feelings. The story blends romance, mystery, and supernatural politics, highlighting her growth from guarded girl to confident young woman who protects those she loves.