While enjoying a leisurely trip to Tokyo, D'Artagnan stumbled upon an enchanting sight - Lucifer singing beautifully under the moonlit sky in a nearby park. This mesmerizing encounter left D'Artagnan's heart racing, even when she slept or was awake. Eventually, D'Artagnan received an exciting invitation from her friend Izumo to attend a concert by the beloved idol group, Angely Diva. This concert filled her with renewed inspiration and a determination to pursue her own dream of becoming an idol. As a result, a series of wondrous events centered around music were set in motion.