The Shiina Mahiru figure stands about 14 centimeters tall, capturing her recognizable calm and composed aura. The pose conveys quiet poise, with a gentle lean and a ready, attentive gaze that hints at her caring nature. Fine sculpting details bring her features to life: flowing, lacquer-smooth hair with carefully carved strands, a delicate expression that balances warmth and reserve, and the subtle folds of her outfit rendered with crisp pleats and soft shading. The finish emphasizes a clean, refined look typical of FuRyu’s style, from the glossy shine of the hair to the matte texture of the clothing. She is mounted on a compact base designed to function as a noodle stopper, featuring a minimal decorative motif that does not overpower the figure. Overall, the piece conveys grace, presence, and the sense that she is ready to engage with the world around her.

In Otonari no Tenshi-sama ni Itsunomanika Dame Ningen ni Sareteita Ken, Shiina Mahiru is introduced as a neighbor whose idealized public persona hides a more intimate, vulnerable self. The story follows her interactions with the series' quieter, introverted protagonist as they cross paths in everyday life. What begins as a chance act of kindness or a simple conversation gradually evolves into a trusted friendship, and then something warmer. Mahiru's kindness, sense of responsibility, and willingness to protect those she cares about become the thread that ties their days together. Through small acts—a shared lunch, a quiet check-in after a tough exam, or a late-night message—she teaches the value of honesty and emotional openness. The narrative uses slice-of-life moments to explore trust, boundaries, and the courage it takes to let someone truly see you.