Karneval

The Rainbow Promise (1x12)

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Second Ship and First Ship of Circus are off to save Karoku. They manage to take over the security system and take over the mansion, but they can't find Karoku!Karoku is shown with another person talking about Nai coming. Nai remembers his days as an animal with Karoku and reaches for the sky, where the forest opens a rainbow gate, assumedly to Karoku.