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.
I will protect Ruli!
!سوف أحمي رولي
Ich werde Ruli beschützen!
Je protégerai Ruli…
Io proteggerò Ruli!
Eu vou proteger a Ruli!