A few days passed in complete silence from both the Guild and Kai. After the training ended, he returned back to his old life as if nothing happened.
Granted, the school was confused about his disappearance for a whole month and some days. But, it wasn't a problem that mind control couldn't fix. All he had to do was make the teachers think that he was there the whole time.
It was easy enough to do for the teachers but he also had to do it for the students. The reason for that was Eva's insane popularity among them. She was basically a magnet of attention without trying to be one.
In the end, for better or worse, the situation was diffused quickly and the days passed as if nothing happened. Kaya and Eva had to still stay in his house because of their situation. As for Miyu, well, she was a whole different kind of trouble.