A dynamic, highly detailed figure of Comet-kun, styled as the Hoshikuzu Witch Meruru. The character is rendered with a compact chibi silhouette perched in a playful pose, balancing on a starry base that glitters under light. The figure features a flowing witch robe with gradient tones of midnight blue to lavender, trimmed with sparkling silver filigree. A pointed hat tilts jauntily, adorned with miniature constellations and a comet-tail ribbon that trails behind as if caught in a breeze. The face is sweet and expressive, with big glossy eyes, a tiny smile, and tiny blush. The sculpt captures delicate hands, one hand raised as if casting a spell, the other clutching a wand that ends in a crystal-like star. The surface finish alternates between matte and translucent accents, giving the impression of night sky and starlight. The base is designed as a crescent moon with shimmering dust. The overall composition communicates whimsy, charm, and a touch of magical mischief suitable for a collector page.

In the universe of Ore no Imouto ga Konna ni Kawaii Wake ga Nai, Comet-kun emerges as a playful spirit familiar who guards the border between everyday Tokyo life and a hidden cosmos. When a streak of stardust appears in a neighborhood, Meruru—a companion figure known as the Hoshikuzu Witch—recruits Comet-kun to help gather lost meteors that have fallen into the human world. Their mission is to restore a broken spell that keeps wishes from reaching their true target. Along the way, Comet-kun learns about friendship, responsibility, and the fine balance between whimsy and duty. The two travel through late-night rooftops, alleys filled with paper lanterns, and magical dreamscapes that appear only when fans are watching. The journey tests courage and cleverness, while the bright comet tail becomes a symbol of hope. This toy figure captures that moment of partnership, curiosity, and the spark of magic in a familiar world.