In Bocca and Sayoko continuing search for Kurofune, they find Kurofune's Aibar machine, "Jaguar of the Sun". The Aibar machine reveals to them that Kurofune is on a very strange island. They try to make their way to the island and end up in a cave with strange murals.

Bocca meets with Kei in the illusionary bus. They share thoughts about their dreams, and Bocca reveals his feelings for Sayoko. He learns that Kei and all the rest of the children that Horu, the monster, has devoured are digested repeatedly. Bocca later finds himself back at the stadium facing Horu in battle. Having faced that very same battle before, Bocca easily defeats Horu. Horu escapes to heal himself. Bocca and Kurofune meets once again, Bocca wants Kurofune to leave the maze, he tells him that Sayoko is waiting for him. But Kurofune wants Bocca to leave instead and let him finish Horu himself. They both exchange 'arrow fire', and Bocca loses. Kurofune seeks out Horu, and finds him healed. Kurofune tells Horu that he has already killed him and that he will never be able to leave the maze. Kurofune fires a bolt of arrow into the walls of the maze, and runs through the walls. Bocca who was trapped in the maze finally escapes the maze and is pulled out of the sea waters onto a boat, into the waiting arms of Sayoko. They learn that the island had sank a long time ago.