Hikari Amane and Kageya Souta were once inseparable childhood friends, bound by a promise made before they understood what love was. When Hikari’s family moved away, their world ended abruptly, leaving only memories behind—and feelings neither of them knew how to name.

Years later, Hikari stands in the spotlight as a celebrated solo idol, while Souta lives quietly as an introverted game developer in Tokyo, still holding onto the past. Fate reunites them when Hikari is chosen to sing for a game developed at Souta’s company.

The reunion stirs their emotions. Souta keeps his distance, believing his presence would only endanger her career. But Hikari remembers everything—the promise, the separation, and the boy she never stopped loving—and tries to be together him forever despite knowing the consequences.

As their worlds collide again under the unforgiving spotlight, they must face their fears, the cost of fame, and the love they cherished in their hearts since childhood.