An AI decides the cure for loneliness is a public serenade in the middle of class, and somehow that's not the embarrassing disaster you expect, it's the moment everything shifts. Shion doesn't understand why humans hide their feelings, so she just burns through that wall with pure, unselfconscious joy, and watching Satomi get dragged into that vulnerability is the real story. The musical numbers aren't interruptions; they're the only honest language this show trusts to say what matters.
Shion arrives at Keibu High School with an infectious smile and athletic grace that quickly wins over her classmates. What nobody knows is that she's an artificial intelligence in her final testing phase, sent on a specific mission: to pull the isolated Satomi out of her loneliness. Shion's methods are unconventional. She performs elaborate musical numbers in the middle of class, sings directly to Satomi during lunch, and refuses to let social awkwardness get in the way of connection. When Satomi discovers Shion's true nature, her world shifts. Rather than reject the AI, she and her tech-savvy childhood friend Touma find themselves drawn into Shion's orbit alongside a growing circle of classmates, each discovering something unexpected in her unwavering devotion to their happiness. As Shion's singing voice touches each of them, questions emerge about the nature of joy, genuine care, and what it truly means to be human. What begins as an artificial intervention transforms into something far more meaningful.