IDOLiSH7 is more successful than ever, but no one is smiling because a new threat has taken the stage: the debuting idol group ŹOOĻ. Managed by the nefarious entertainment executive Ryou Tsukumo, they will stop at nothing to get their way, resorting to all kinds of underhanded tactics to bring down their rivals. TRIGGER's image has already been ruined by scandal, and IDOLiSH7 and Re:vale are headed for the same fate—or worse. Meanwhile, Zero, the legendary idol who disappeared 15 years ago, continues to haunt the present through those he left behind. His manager seems to be in contact with Tsukumo for his own schemes, and Zero's songwriter reveals himself in a letter after having been missing for years. IDOLiSH7 finds an ally in Re:vale to thwart ŹOOĻ's plans while trying to make sense of Zero's colleagues' actions, but it may be impossible for everyone to emerge unscathed.

The anime will take place 10 years after FLCL Alternative and will center on a high school boy and girl.

After going out for late-night drinks, Yan Yuechu and his colleague Hu Zhi find refuge from the rain in a rather unusual place: the building harboring Xu Aiyou's escape game, XY. Despite the game's infamy and its mysterious owner, the duo decides to give it a try. With one hour to solve riddles and find their way out of a maze of eerie rooms, Yan Yuechu and Hu Zhi manage to clear the game in time. However, glimpses of what appears to be Xu Aiyou's troubled past scattered throughout the game leave a deep impression on the men—an impression so lasting that vivid scenes from new escape games creep into their dreams. The following day, Yan Yuechu receives a letter advising him to stay away from escape games. Although he does not receive conclusive answers from Xu Aiyou, he dreams once more that he must solve a puzzle to escape from his own bedroom. But was it truly a dream? Unsure where reality ends and illusions begin, Yan Yuechu will have to uncover the truth behind XY if he wishes to preserve his sanity.

Shizuma Origasa, once a renowned samurai in the Aizu Domain, has fallen on hard times following his home region's crushing defeat against the new imperial government. To make ends meet, Shizuma now works as a rickshaw puller in Tokyo. Meanwhile, he tirelessly searches for his missing fiancée, Sumie Kanomata, the younger sister of his close friend Gennosuke, who had entrusted Shizuma with her safety in his final moments. After foiling an assassination plot, Shizuma is hired by the police force, and he uses this opportunity to further his pursuit of Sumie. However, he soon lands in a whirlpool of political conspiracies involving government loyalists, persistent rebels, cunning courtesans, meddlesome foreigners, and even a mysterious yakuza member, Kyoushirou Shuragami.