After Akari shines as the Starlight Queen, Ichigo and Akari, as their unit "Cosmos," hold their first live performance, which is a great success! As time passes in this way, Ichigo and the other third-year high school students at Starlight Academy begin to become aware of their graduation, which is now only half a year away. Even after graduation, their idol activities will continue. However, graduation is both a milestone and a turning point. Ichigo, Aoi, Ran, and the others, as idols, begin to carefully consider, one by one, what paths they wish to walk from now on.