Spoiler answer?
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I don't think he did tho, I mean he did say he have a lot of gfs (which idk If it's true or not) but I think by what he mean with polygamous is his country? Or his tribe? Idk how to call it is allowing polygamy.
And maybe he did have several girls back there but since meeting mako I believe he only love mako
Thank you for your response
One of the main things about polygamy is the consent from their partner, it's just cheating if the other one isn't fine with you being with other people and Luca knows that. It's already implied that Mako isn't fine with that by the way he got jealous with the girls and Luca noticed and decided to respect that. Actually a lot polygamous people are in a close relationship for the very same reason.
This actually was better than I expected. I'm happy the author did her research. I cringe so bad reading manga with foreigners and u can clearly tell they did no research whatsoever...(*cough* the idea that Americans greet people by kissing them on the LIPS uh no???)
***Spoiler question below****
Not sure if someone asked this, but its mentioned that he's polygamous. So is it implied that he had other sexual partners while he was officially dating mako long distance?