the way certain bits of dialogue were worded throughout this series, it made it seem like Machino would be learning about different forms of love--romantic, platonic, agape, whatever-else...as even her moment with Olivia in the ferris wheel made it seem like she was really plumbing the depths of what it means to "love" someone, or "be in love with" them, and all the varied nuances and intricacies that such feelings can involve and evoke.
it does not seem like that will actually play out in any meaningful way, however, as it really does feel like the author is choosing the very conventional "love means a single monogamous relationship", and everyone and everything else will be rejected and left by the wayside.
Even if Machino chose only Sophia (or only Olivia), there was so much room for exploring non-romantic love, as I suspect will be the end-state for this series where Machino is concerned. even if she were to marry Sophia, for example--there could have been room to define and portray and flesh out other forms of bonding and companionship with the others, and how that can be just as important, even if it's not "the standard".
Kinda unfortunate, given how much room there was with the premise of Machino's character and the clearly-built harem of characters that all had their own facets of connection that could have been explored and nurtured.
But alas. Maybe that sort of idea's too niche, or too "unsafe" to be considered viable when making a series with the intent of earning income off of it.