A few days passed quietly during which Kai and Aria lived normally for the most part. Eva was able to return home the next day when she was certain that Arthur wasn't suspecting her. As for Kaya, she still had some work so she couldn't come back yet. Added to it was the fact that Kai asked her to keep an eye on her surroundings since there was a chance she was being followed.
However, Kaya didn't discover anything suspicious which eased Kai's worries that she was a part of the suspected people that are close to him.
Either way, he was able to control the situation with minimal effort which eased his mind enough to focus on other things. One of these things was the rapid development of the Temporary Origin.