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 haven't found my perfect hobby yet!
!لم أعثر على هوايتي المثاليّة بعد
Ich habe noch nicht das
passende Hobby für mich gefunden!
¡Aún no encontré mi afición perfecta!
¡Aún no he encontrado
mi afición perfecta!
Et moi,
je n’ai pas encore trouvé ma voie !
Non ho ancora trovato 
l'hobby perfetto per me!
Eu ainda não achei um
passatempo que me contemple!
Я ещё не отыскала своё идеальное хобби!