This figure captures Koshimizu Sachiko from THE iDOLM@STER Cinderella Girls in her Jishou Sweet Heroine ver, a design that blends bright charm with a hint of sugary elegance. Sachiko is posed in a dynamic, upbeat stance that conveys her confident stage presence and warm personality. Her costume features a pastel color palette dominated by soft pinks and crisp whites, with lace trims, glossy accents, and miniature accessories that evoke a sweet heroine motif. The sculpt emphasizes delicate curves and fluid lines, from the flutter of her sleeve ruffles to the tilt of her head, while the base complements the overall heroine aesthetic with subtle star motifs. The paintwork is precise, with gloss finishes on her hair, glossy eyes that capture light, and shading that adds depth to her sculpted figure. The character's expression reflects both determination and kindness, inviting fans to imagine her performing her favorite song on a sunny day. Overall, the piece presents a polished, museum-like quality that pays homage to the Cinderella Girls universe while celebrating Sachiko's unique appeal in this Sweet Heroine rendition.

Koshimizu Sachiko is portrayed in the Cinderella Girls universe as a cheerful, determined idol who thrives on stage energy and audience smiles. In the series, she participates in auditions, builds friendships with fellow idols, and works to balance training with personal growth, always aiming to bring joy to fans. Her charm lies in a bright, optimistic outlook and a willingness to support teammates even in challenging days. The Jishou Sweet Heroine version frames her as the sweetheart heroine whose stage persona blends sunny radiance with a touch of playful mischief, reflecting her role as center-stage performer who leads by example. This portrayal emphasizes her signature sweetness, resilient spirit, and commitment to turning dreams into performances that inspire others to pursue their own passions.