Natsuki Shinomiya grew up steeped in the world of his family's traditional Japanese confectionery shop, immersed in classical arts and music from childhood. This environment cultivated an appreciation for traditional melodies, though he later developed a strong passion for contemporary idol music, sparking internal conflict about his artistic direction.

He enrolled at Saotome Academy to pursue his dream of becoming an idol. Training brought challenges in balancing family expectations with his personal aspirations, leading to self-doubt concerning his musical identity. His journey involved reconciling these contrasting influences, learning to weave traditional musical elements into modern idol performances. This synthesis became a hallmark of his artistic expression within his group.

As a vocalist and performer in the idol unit ST☆RISH, he participates in national concert tours and collaborative activities. The group's demanding schedule of public appearances, commercials, and interviews sometimes leads to member fatigue. Following their success at the "Maji LOVE LIVE Kingdom" concert, the unit enters a period of reflection about their future amidst ongoing commitments. During a reward "glamping" trip organized by their advisors, he engages in group bonding activities like campfire gatherings, strengthening camaraderie with fellow members.

His personality reflects a gentle and caring disposition, likely shaped by his family's background in hospitality and tradition. He often assumes a nurturing role within the group, showing concern for others' well-being during stressful times. Throughout ST☆RISH's journey, he maintains a focus on group unity and collective growth, seeing their shared experiences as fundamental to their identity. His development centers on finding confidence in his hybrid musical style and valuing teamwork as essential to the unit's success.