The central theme of the series revolves around Vivy's mission: "To make everyone happy with my singing". To fulfill this singular directive, she must grapple with a complex question: what does it mean to put one's heart into a song?
: Vivy is paired with Matsumoto, a talkative AI from the future. Their partnership represents the conflict between cold utilitarianism (Matsumoto's focus on the mission) and burgeoning emotional intelligence (Vivy's focus on individual happiness). Vivy -Fluorite Eye's Song
: Throughout her long life, Vivy witnesses AI behaving with both human-like love and machine-like indifference. This duality forces her to evolve beyond her original programming to develop something resembling a soul. The central theme of the series revolves around