@Admiral_Otaku
"The girl thought she had no chance, but she won in the end" is one of the most tired tropes.
@Stannis
What makes you think she would've won if she told him who she was? That's quite a self-centered way of looking at it.
It really shows how you completely missed the point of her character. Great job.
@Kipsta
Yotsuba isn't the "first girl". "First girl" refers to the girl who was shown first in the manga, not the chronological order. No one calls childhood friends "first girls".
She didn't confess first or ever. Bait and switch "it was just a prank bro!" doesn't count as a confession as you're not making the other person aware of your feelings by pretending it was a joke.
There's not such a thing as "most deserving" when it comes to love. How much effort you've put in, or how much you've suffered for it doesn't mean jack shit.