If I had to liken Kuroki-san to something, I guess I'd say she's like a hymn to humanity.

Right!

I think what makes her amazing is her bravery!

And what's good is that she herself is originally a quiet and reserved person.

I get you!

It's the gap in perception of how she looks so withdrawn but also suddenly does things that make your heart skip a beat.

And she doesn't get discouraged even if she fails...

That's right... makes you just want to be by her side and snuggle up to her.

No, that's not it. Kuroki-san being aloof is what's good.