During a leisure trip to Tokyo, D'Artagnan is captivated by a mesmerizing scene: Lucifer serenading under the moonlit sky in a park. This encounter sparks a relentless flutter in D'Artagnan's heart, both day and night. Attending a concert of the famous idol group Angely Diva with her friend Izumo, D'Artagnan decides to pursue her own dreams of becoming an idol, setting the stage for a tale woven with music and extraordinary occurrences.