This one doesn't chase you, and that's the whole pitch. It hands the runtime to SolidS, SOARA, Growth and QUELL in rotation and quietly asks whether you already have a favorite unit picked. If you do, thirteen episodes of studio time, radio spots, agency logistics and the low-grade friction between guys who share a name on a poster is exactly the thing you wanted. Nothing detonates, nobody has a tragic backstory reveal at episode nine, and the show is completely at peace with that. The tradeoff is real: personalities get sketched instead of developed, and coming in cold from outside the Tsukiuta orbit means you'll be squinting at a wiki by the second episode. But if you've already got a bias, watching your four favorites bounce off three other groups feels less like an anime and more like catching up with people you know.

Four idol units from Tsukino Entertainment Production, SolidS, SOARA, QUELL and Growth, are set to perform on the second day of the yearly Tsukino Concert at the Budokan, and each leader has to write songs for his group. Shiki Takamura of SolidS cannot find inspiration. Sora Oohara has to get past old mistakes while pushing SOARA forward. Shuu Izumi wants to leave his earlier fame behind and lift QUELL to the popularity his former unit enjoyed. Growth's leader, Kouki Etou, is reluctant to team up with the rival group ZIX before their debut. The music series tells all four stories side by side, following the members' daily lives as the concert approaches.