my guess is that the person at the end is the constellation killer or one of the constellations be just defeated recently. but this world is going to be a hard adventure.
Yup my thoughts exactly you should protect the people you care about or die trying. It's far saver for them to be traveling with you especially since your a boy instead of two beautiful women traveling by themselves who could be be good prey to a group of slavers...
I was thinking that it's a good thing that the other two are there since if the story were more adult the slime would be having more "fun" pranks. Also, if it were more adult the girls would have probably done more stuff with him at night, but that is not the case since it's so wholesome.