
There are many sentient plushies that can be found throughout the SEKAI. Onstage, troupe leader KAITO and his helper Hatsune Miku put on elaborate shows to help the group discover their true feelings. Tsukasa's SEKAI, the Wonderland SEKAI, is a theme park world filled with fantastical encounters, like singing flowers and walking stuffed animals - forgotten creations made by a young Tsukasa for his sister, Saki, a long time ago.

There, the pair meet Hatsune Miku, KAITO, and the plushies they perform with. Upon playing it, the two are transported to SEKAI. While Emu tries to convince Tsukasa to join the Phoenix Wonderland troupe, Tsukasa discovers a song named "Untitled" on his phone. The two actors recruit stage director and roboticist Kamishiro Rui and shy singer Kusanagi Nene, along with her robot replica Nene-Robo.

After failing his audition, Tenma Tsukasa is hired by Otori Emu to return the Phoenix Wonderland Stage to its former glory with incredible performances.
