@kzzz1 I don't think that's the case, if you're suggesting that Nagi's biological father might have cheated or give birth to hiro and abandoned her then no, because this is a RomCom. I doubt it's gone to take a dark turn. This is how I see it, given that this is a Shonen and a RomCom, I doubt it would ever show anything related to polygamy or cheating. It's just that this isn't the target audience for this kind of stuff, if an author wants to do that this manga should've been a seinen or josei and most likely wouldn't have been a RomCom. I might be wrong or even misunderstood what you're trying to say.