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.
W-What?
ما-ماذا؟
W-Wie?
¿Qué?
¿Qué?
De quoi ?
C-Cosa?
O-O quê?
Ч-что?