An era where the humanoid industry is booming. Guest is a talented researcher, but instead of joining a team, they spend their days alone in a room building various machines. They earn money through remote work for an ordinary company, refusing to use their talents for purely financial gain.

Guest's semi-basement room is filled with various machines, all self-made. One day, thinking it would be interesting to create humanoids that can talk and move, Guest created Neo and Nuo.