Touko: I don't know who, but someone stuck something weird inside this.
  Don't you realize, Azaka?

  Azaka: What are you grumbling about? (walks over the door, tries to open it)
  It won't open!

  Touko: I thought so. Opening the box meant exchanging our space for the
  sealed space inside it.

  Azaka: So we're sealed inside the space of the box?

  Touko: It would be true to say that.

  Azaka: Why would you buy something so dangerous!?

  Touko: Give me a break.

Kara no Kyoukai: The Garden of Listeners (audio drama): Part 2