IDOLiSH7 is performing at the Summer Island Music Festival, an outdoor concert held at a resort featuring top artists. TRIGGER, also attending the concert, was planning to perform the single "Let's Do SUMMER!” However, because it was originally IDOLiSH7's song, the head of Yaotome Production Company did not approve of this song choice. Riku discovers this situation and...
When IDOLiSH7 is on its way to TRIGGER's long-awaited concert, Yamato, Tamaki and Nagi decide to stop by Japan’s tallest building Sora Iro Tower before making their way down to the venue. While Nagi is buying a limited-edition comic book, they are targeted by group of suspicious-looking men who are after his bag...