After spending 10+ years with some harem & romance manga, I know for sure that Mona is the endgame. Either her or an inconclusive ending.
Judging by this manga's setting, the author will need to come up with an out of this world scheme in order to choose another girl as the endgame. And I'm sure many people will still hate it.
Obviously, harem end is a no no in this setting.
This is why I love the current chapter. It simply showcases the present state: the comedy, the girls' charms and all that.
Let's just savor it chapter by chapter. I really like the character design & styling in this one.