Souichi's body was destroyed by an accident in a laboratory. His brain survived and is now connected to the main unit of a workshop he made in his house. He can materialize a hologram of himself throughout his own house.
Unlike Saya, Souichi is talkative and is said to sometimes talk all day if he is in the mood to. He isn't bothered by the accident to his body but is rather satisfied as he is able to do more precise work and work on whatever he wants to.