An hour passed before Aria finally woke up, just when Kai and Eva were about to leave the apartement to buy some stuff. So, Kai simply told her to eat the food on the table and stay put. Kaya had already left to deal with some matters and wouldn't be back till later so the apartement would be empty except for Aria.
He also made sure to keep track of her at all times. Transferring her to the school will take at least one day even if Eva pulled some strings to make it happen quickly and they were still in winter break so they can't go to school either.
Keeping a small tracker on Aria should be more than enough for him to react in time if something happens.
With that, he left with Eva. The two walked out of the apartement complex.
"Are you sure it's gonna be ok?"