I think this is a different person who happens to be passing by (perhaps even Cockroach Keeper himself) who may unintentionally save Ant. If all else fails we do know that all of the main bugs eventually reincarnate into a happy human life anyway.
Not that I don't appreciate mixing things up a little, but why is You there instead of Chika?
Not sure, but it looks like Chika (or her VA) isn't actually going to appear in the tour. The schedule in the link seems to just have You, Yoshiko, and Ruby representing Aqours.
