To preserve the peace of Holly Leaf Castle, Mithril Lid Pod organizes a ghost hunt with himself as leader. That night, Challe captures the ghost who, as it turns out, has a deep connection to the castle and is determined to protect it.
That's how he did those things 
to everyone's locks.
.بتلك الطريقة قام بتلك الأشياء لأقفال الجميع
Er war das also an den
Zimmertüren von uns allen.
Por eso podía abrir las puertas.
Por eso podía abrir las puertas.
D’où les portes
qui se déverrouillaient.
Quindi è colpa sua se le porte delle stanze...
Por isso ele consegue
abrir todas as trancas...
Теперь понятно, кто открывал наши двери.