Real Delusion's Interference
Since some of his classmates didn't join Real Delusion, Realius didn't bother in creating an identity for them which led to this current predicament.
From the use of Realius' reality manipulation, he had already foreseen the future where his classmates were followed by some of the warriors from the Warrior's Association as well as the agents from the United Nations.
But since the strongest warrior on planet earth was only at Mid Realm Peak Stage, Realius wasn't that worried since the gap between Mid Realm Peak Stage and High Realm Initial Stage was quite high.
Not to mention, not only Shirley and Jeremy but Deus was also at the High Realm Initial Stage. Even if Realius who was at Perfection Realm Peak Stage was excluded, the three of them alone were enough to dominate planet earth let deal with ants who pursued them.