Nitta Futami shares Kosmos Manor with his childhood friends—talented girls who won scholarship spots at the idol-focused Koei Gakuin through their singing and piano skills but struggle to manage daily life on their own. As the school festival approaches timed with Jugoya, the childhood friends are chosen as the main performers. Strange behavior and a mysterious bracelet warning them that time is running out begin to unsettle everyone, and Futami tries to hold things together while rediscovering a dream he had almost forgotten.