Kaoru, a friend from the piano class Ruli once attended, has gone missing. While searching for her, Ruli and the gang find a strange dent and her shoes. And as they continue their search, Hiro is suddenly asked a mysterious riddle.
kanjiru michi e no material
spüre ich etwas Unbekanntes.
Algo me arrastra a lo desconocido
Algo me arrastra a lo desconocido
Et tu trouveras
Le chemin de l’inconnu
Eu sinto uma matéria que 
me leva ao desconhecido
ощущаю нечто неведомое.