A strange butterfly flies into the bus. It is a "Hotaru" butterfly, depicted in Haruhiko's books for children. Kakeru and Blink follow the butterfly to get a clue as to his father's whereabouts, but end up in a strange place. Here they find Emperor Gross's villa, and an ex-entomologist called Nana who is planning to use Hotaru butterflies to take revenge on Emperor Gross.
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