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.
patto furikaettara futo
Sobald ich mich umdrehe
und nach hinten blicke,
Quando eu viro para trás e olho