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.
Darling and Hiro were turned into stone!
!عزيزي وهيرو تحوّلا إلى حجر
Mein Darling und Hiro
wurden in Stein verwandelt.
¡Mi cariñito y Hiro
se convirtieron en piedra!
¡Mi cariñito y Hiro
se han convertido en piedra!
Darling et Hiro
ont été changés en pierre !
Il mio tesoruccio e Hiro 
sono stati trasformati in pietra!
O queridão e o Hiro viraram pedra!
Милый и Хиро превратились в камень!