I don't think she is a losing heroine, after all this is a harem manga, so no losing ones, yay~
unless, it's a The Quintessential Quintuplets route, again. I am talking about The children of the Shiunji Family
if I had to guess - the way Atsumu is, I don't think any of them are "getting with" the MC in the strictly romantic relationship sense.
It'll be a harem of women of various professions within the entertainment industry (betting our CHF here does something in the same vein on the side as a hobby, and she'll be "encouraged/convinced" to make it a full-time gig with accidental/incidental assistance from the MC) and he'll help each one in some capacity achieve their goals, and at the end of the series they'll all be around him having fully fallen for him but he'll still be the dense "why are all these pretty girls so stressed whenever they're around me I don't get it" that he's been up to now, and he won't officially date any of them but treat them all as dear friends.
I also wonder if he'll end up with a heroine/friend for each sister, potentially also his mother, as "replacements"; they each meet their downfall, a heroine takes their spot, and he treats them all like sisters/family (not romantically) and so they all "win" with none of them actually getting to date the MC (so they all "lose" as well).
That all assumes Atsumu doesn't gain awareness before the end. Poor dumdum's so wrapped up in wanting a normal high school life that he doesn't even realize his god-tier abilities (even as they've been pointed out to him by people at this point, which doesn't usually happen this early in with these sorts of "MC is OP but idiotically oblivious" gimmicks), and romance doesn't seem to be on his radar at all. He treats everyone he's met as purely good people (including his clearly bad family), and that's a setup for none of the heroines to stand a chance of winning him, being treated equally platonic as they all are.
So maybe MC will clue-in to the reality of his situation eventually, but if this far in is any precedent, then I suspect my guess at the ending above will be the result.
(and in a meta sense, it means the "favorite heroine" of any given reader can be said to have not lost, which means "no losing ships" by virtue of "no canon winning ships", so everyone can imagine their favorite girl takes the trophy off-screen.)