The Kouzuki Mahiru figure presents a refined nocturnal heroine poised at the edge of the sea’s glow. Her hair is sculpted as a flowing mane of deep indigo with subtle midnight blue highlights that shimmer under display lighting. She wears a navy maritime-inspired outfit adapted for a night-scout theme: a short cropped jacket over a ruffled blouse, a pleated skirt that falls to mid-thigh, and knee-high boots with silver buckles. A detachable glass jar in her left hand contains a tiny luminescent jellyfish, casting a soft bioluminescent glow on her face. Her right hand rests gracefully at her hip, fingers curved, suggesting quiet resolve. The base recreates a coral reef texture with translucent pink elements to evoke jellyfish tentacles drifting in water. Fine paintwork delineates facial features—bright eyes, pale lips, and a gentle blush—while the sculpt captures the elegance of a calm, capable explorer.

Kouzuki Mahiru belongs to the world of Yoru no Kurage wa Oyogenai as a thoughtful scholar and protector of nocturnal marine life. Raised near a submerged metropolis, she learned to read the currents and listen to the stories carried by jellyfish lanterns that drift through moonlit streets. Her daily life blends meticulous research, diary sketches, and small acts of kindness toward creatures and companions who share her night-bound world. Though soft-spoken, she possesses a fierce sense of duty, often stepping between curious humans and fragile habitats to keep balance between exploration and preservation. In the series, Mahiru navigates friendships that test her patience and courage, confronting legends of a shadowed reef that could swallow whole districts. This figure captures her poised center—the calm observer who becomes a quiet beacon when danger rises and hope flickers aboard the tide.