Robert, an adventurer, is looking for the legendary "luminous ship." When Kakeru and the others come upon Robert, he tells them of a certain legend. Long ago, a young man, whose lover had been taken away on a dark ship, went to save her in a luminous one. Only the luminous ship can find the dark one on the dark river. And now, Emperor Gross has the dark ship, and he is going to force Kakeru's father Haruhiko on board!
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