Naoya Matsui, a spirited student at Kazuki High School in Osaka’s bustling entertainment district, shares classes with Sakamoto Yayoi at the private academy. His ESTP personality—The Rebel—fuels an energetic, thrill-seeking demeanor defined by spontaneity and sharp problem-solving instincts. Quick-witted and adaptable, he thrives in fast-paced scenarios, leveraging his impulsive charm to navigate challenges while chasing excitement.

Within the story, Matsui’s lively exchanges and unpredictable choices drive comedic momentum and performance-centric plotlines. He alternates between aiding and complicating the main characters’ endeavors, injecting humor and tension that steer event outcomes.

His design—dynamic visuals and brisk vocal cadence—echoes his restless impulsivity, ensuring a vivid narrative presence. Through evolving relationships and self-discovery, Matsui subtly shifts group dynamics, anchoring themes of collaboration, humor, and artistic ambition.