The robot companion of Agarta, 3-5-10 assists Agarta with her work &amp; can communicate with her as she enters the clients consciousness. He is responsible for collecting the "payment" for the services rendered by Agarta as well as storing and organizing her memories. His other duties seem include running &amp; maintaining her ship &amp; communicating with clients. He makes a reference to the fact that he was once human.

A young woman awakens in a desolate town with no inhabitants. She’s unable to read signposts or remember anything about who she is or what she’s doing there. All she can do is recognize the symbols that appear on her hands, identifying her as Agarta, devourer of dragons. Alone and in an unfamiliar place, Agarta must remember the reason she is there and defeat the evils within.
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(Source: Anime-Planet)