Monster Strike 2: Monster Sonic! D'Artagnan no Idol Sengen

モンソニ！ ダルタニャンのアイドル宣言

When D'Artagnan went to Tokyo for a little fun, she spotted an unforgetable sight: Lucifer singing while basking in moonlight in a park. From that moment, no matter if she was asleep or awake, D'Artagnan's heart would not stop throbbing for some reason.

One day, D'Artagnan sees a concert by the popular idol act Angely Diva at her friend Izumo's invitation. There, she resolved to follow her idol dreams, and the story of song and miracles begins.

(Source: Anime News Network)