S1, E4: Professor Kupps has made it to 3WA headquarters and has hidden himself in a virtual reality role-playing world of his own creation. It'll be up to Yuri to go in there and save him. Kei leaves headquarters but notices the blue uniformed men from the first episode on the subway; they are plotting to attack 3WA and kill Kupps. As Yuri enters a stronghold and fights fantasy monsters in the virtual realm, Kei gets dragged into 3WA headquarters.