
Satomi is a solitary high school student who finds comfort in her own company, content with the quiet rhythm of her everyday life. Everything changes when Shion, an AI with a lively spirit, transfers into Satomi's class, greeting her with a heartfelt song and a promise to bring happiness into her world. Shion's charming but unmistakably artificial antics, complete with musical performances and fairy-tale costumes, initially set her apart from the human students.
Despite Shion's otherworldly nature, her presence begins to thaw Satomi's reserved heart, drawing her into new friendships with four classmates who had previously kept their distance. Together, they embark on a journey filled with laughter, music, and shared experiences that craft moments of genuine connection and joy. These new bonds give Satomi and her friends a fresh perspective on life and happiness.
As memories are made and emotions deepen, the fragile line between human and artificial begins to blur, raising poignant questions about the nature of memory and existence. Even as they cherish these precious times, they face the inevitable truth that memories—and even the most treasured data—can be lost or erased. 'Sing a Bit of Harmony' beautifully explores themes of friendship, belonging, and the bittersweet impermanence of life through the lens of a unique relationship between a girl and an AI.