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