Wikipedia said: Robotics;Notes is set in 2019 on Tanegashima, an island to the south of Kyūshū in southern Japan. The game's theme will be centered around robots and the question "What would happen if you really tried to make a giant robot?".
And the conspiracy, plot had little to do with Robot, only the character, and "What would happen if you really tried to make a giant robot?" is BS, whether or not they make a giant Robot the conspiracy will still happens, only with no ways to stop it, even then that giant Robot was forced to be relevant to the plot in the end, I mean if someone was gonna kill 5 billions people governments from the all over the world would scramble all kind of military and even nukes to stop that in less than 5 minutes.