A year and a half after graduating from Shining's arts school and signing with Shining Studios, Nanami Haruka still hasn't broken through. Her contract has a deadline: write a song that makes an impact before the second year closes, or it ends there. Thirteen princes are willing to help. With the senior idols, the work centers on a major music festival. With her former teachers, the challenge is navigating a relationship that has changed since graduation. And with the seven who graduated alongside her, the task is writing a single song for all of them together — before choosing one of those seven as her final partner.