TV-Series
Description
Natsuki Shinomiya is a student at Saotome Academy assigned to Class A and a member of the idol group ST☆RISH. He is a tall young man with wavy blond hair, light green eyes, and a pair of oval glasses that he typically wears. His demeanor is gentle, kind, and romantic, and he carries himself with a calm, easygoing warmth. He has a strong fondness for small and cute things, which leads him to form an immediate attachment to Haruka Nanami, comparing her to his pet dog Elizabeth. Natsuki is a fan of the mascot character Piyo-chan.

In terms of personality, Natsuki is naive and air-headed at times, yet he demonstrates surprising insight in certain situations. He is a romantic at heart and often speaks with a soft, meandering thoughtfulness. His main hobby is cooking, but he is completely oblivious to the fact that his dishes are disastrous and inedible, often causing those who taste them to fall ill. He has a particular liking for tea and cookies and dislikes junk food. Natsuki plays the viola; he originally played the violin when he was younger but switched to the viola after a traumatic event in his childhood.

The central defining element of his character is a split personality condition known as Gemini syndrome. Whenever his glasses are removed, an alternate personality named Satsuki emerges. Satsuki looks identical to Natsuki but possesses a violent, short-tempered disposition and superhuman strength, having reportedly hospitalized tens of thousands of people in attacks. However, Satsuki is also a musical genius, capable of spontaneously composing remarkable music. Natsuki has no memory of what happens while Satsuki is in control. This condition originated in Natsuki’s youth when a teacher he loved and admired betrayed him by stealing a composition he had written for her and using it to further her own career. The resulting feelings of anger and despair created Satsuki, who exists to protect Natsuki from being hurt again.

Natsuki’s role in the story is that of a gentle and supportive presence within ST☆RISH. He often serves as a calming influence and a moral support for his fellow members, acting as a buffer during emotional conflicts. He is a key member of the group, contributing his musical talent and his ability to maintain harmony among the members.

His most significant relationship is with Syo Kurusu, his childhood friend and roommate. They grew up together and competed in violin competitions. A shared childhood incident, in which Natsuki chased Syo up a tower and Syo nearly fell, resulted in Syo’s fear of heights. Their bond is close but often strained by Natsuki’s obliviousness and his disastrous cooking, which Syo frequently ends up tasting. Natsuki also forms a connection with Haruka Nanami, seeing her as someone who understands his music, and shows protective feelings toward her. In the later seasons of the anime, Natsuki reconciles with his Satsuki personality, integrating both sides of himself and becoming a whole, more stable individual. This acceptance marks a key part of his development, as he overcomes his past trauma and learns to express his own feelings more openly.

Natsuki’s notable abilities include his talent for composing, which is elevated to a genius level through Satsuki, and his skilled viola playing. He also possesses extraordinary physical strength inherited from his father, and he is uncommonly tall at around 186 centimeters. He is not affected by his own cooking.
Cast