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.
What was that?
ماذا كان ذلك؟
Was war das denn?
¿Qué fue eso?
¿Qué ha sido eso?
Quoi ?
Cos'è stato?
O que foi isso?
Что это?