Kana: This town is surrounded by walls.
Both the Haibane and townspeople are forbidden to go outside of town. The only exceptions are the Toga. They come from outside for trade like this.
And those standing next to them are the Gate Keeper and the Communicator from the Haibane Renmei.
Rakka: The Communicator?
Kana: The residents of the town aren’t allowed to speak with or touch the Toga. Likewise, the Toga would never come near us and they can’t use their voices while in town. The only person who can “speak” with the Toga is the Haibane Renmei Communicator.
Hikari: They communicate by making shapes with their hands like that. But I’m just making it up. It’s a language only they understand.
Nemu: In short, The Haibane Renmei serves as an intermediary for the trade between the Toga and the town. And part of the profit pays for things such as the utilities for Old Home and support for the Younger Feathers.