The Tower of Parting - S1.E13

As Kaito pushes through the puzzle, believing Rook is in danger, Nonoha and the others decide to fly to England, learning the truth about Fool's Puzzles from Souji on the way. As Kaito reunites with Rook, he tells him about their old master, Jin Makoto. As the puzzle room starts to fill with fire, Kaito's Orpheus state activates and he reaches the top, only to find there is no exit. It is then that Rook reveals he is a POG giver who created the puzzle and wanted Kaito to ascend to Phi Brain. As Kaito falls unconscious from the shock, Rook saves him from falling into the fire and leaves him for Nonoha to find.