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 am darkness.
أنا الظّلام
Sono l'oscurità.
Eu sou a escuridão.
Ответь: тьма.