They're in the matrix, basically. Everyone was a plant or an automation to experience specific things through the lens of people. Hence why he was so able to find everything he needed so easily. Ai is the plant to make MC fall in love with her, Yuuki is probably the plant to increase his libidio, etc. Everyone in this world is hooked up to his brain to live vicariously through him and now that he's got the key, everyone knows what's going on.
@jcc-2224 @Thank @blablablub