First the cute boys, now Pilse and Ai... this arc is launching some good ships.
I just hope that Ai doesn't sacrifice herself at the end of the current arc. The whole "Japanese maiden with an unspecified, but debilitating condition" trope is a popular death flag IIRC... :-(
Probably not, seeing how this condition is likely directly related to the current enemy's goals. It is possible, however, that this will cause them to die, possibly to cure Ai, keeping with the theme so far established earlier with Pepesha's mother going back to the dead.