From the front, the 1/7 scale figure set presents Hoshino Aquamarine and Hoshino Ruby in an eye-catching duet. Aquamarine towers slightly over her sister, her teal hair cascading in soft waves, and her outfit painted in cool aqua tones with pearlescent highlights that catch the light. Her pose conveys calm confidence, one hand lifted as if guiding a performance, the other resting at her side. Ruby counters with a warm palette of crimson and gold accents, her dynamic stance suggesting bold energy and independent spirit. The two figures share a coordinated base featuring a crystalline motif that hints at a stage spotlight and the nautical theme suggested by their names. The paintwork emphasizes depth with subtle shading, gradient hair tones, glossy eyes, and translucent elements on atmosphere-soft accessories. Overall, the set captures the charm and contrast between the sisters while remaining highly detailed and display-ready.

Hoshino Aquamarine is introduced in Oshi no Ko as one of Ai Hoshino's children, a symbol of ascending fame and the pressures that come with being a child of a renowned idol. Gifted with her mother's stage presence and a sincere desire to connect with fans, she navigates the complexities of growing up in the public eye while also pursuing her own dreams. The narrative follows her exploration of identity, the expectations of fans, and the darker turns that fame can take as she tries to carve out an independent path. Her relationship with her sister Ruby adds warmth and tension to the story—two siblings supporting each other while pursuing rival goals on contrasting trajectories. Through trials and triumphs, Aquamarine's arc highlights themes of legacy, self-discovery, and the cost of artistry.