Satomi Amano, a standout student and the daughter of a prominent project manager at Hoshima, a groundbreaking AI company, faces social isolation due to her status. One day, she stumbles upon her mother's groundbreaking project: an AI designed to explore human-robot coexistence. Intrigued, Satomi heads to school only to find the AI, Shion Ashimori, posing as a fellow student. Tasked with blending in while secretly aiming to bring joy to Satomi, Shion uses her musical talent to forge connections and soothe Satomi's inner turmoil.