Kirara-chan's boyfriend has been transformed into a mouse by the Moon Goddess as punishment for something he would prefer not to discuss. To reverse it, he needs the first star that falls from the castle of stars—which required sneaking in, which went badly, and which scattered the sleeping stars across the sky. Tonight has no stars. Kirara-chan straps on her magic shoes and jumps out the window to collect them all before the night sky stays dark forever.