The romance finally stops circling and actually moves. Haruka has agency now, the guys feel like a real team instead of isolated love interests, and the music does something the earlier seasons didn't quite nail: it sounds like these characters are building something together, not just performing for you. QUARTET NIGHT arrives as a genuine threat and a foil that makes ST☆RISH sharper, meaner, funnier. The dialogue repetition is brutal and lazy, but when a song lands, and they do, it erases three episodes of filler in one burst. This is the season that finally justifies why you kept watching.
Haruka Nanami has landed her dream job as a composer at Shining, the prestigious agency behind Japan's biggest idol groups. Working alongside ST☆RISH, the talented boys she's supported from the start, she finds herself navigating a new challenge: competition from QUARTET NIGHT, a seasoned idol group with years of experience and legions of devoted fans. When a major international sports event announces it's searching for performers to headline its opening ceremony, the agency becomes a battleground. Every idol wants this shot at global recognition, and the stakes have never been higher. Haruka must balance her growing feelings for the ST☆RISH members while staying focused on her work, crafting music that can compete against QUARTET NIGHT's polish and prestige. Rivalries intensify, egos clash, and the pressure mounts as both groups prepare to prove they deserve the spotlight. Between rehearsals, romantic tension, and the cutthroat world of idol entertainment, Haruka discovers that making it at the top means sacrificing more than she ever imagined.