preface: I see I'm in the in the minority regarding "best girl", as I didn't get persuaded by Koi's supposed charm. I find her character to be arbitrarily "perfect in being imperfect". Still...
Damn right, she did it.
There's a saying where I come from: "You leave it in the jungle, the gorilla will take it with him."
Now, I do however have some aprehesion because I feel like this event of characters kissing in the heat of the moment frequently gets sidelined/ignored for a few chapters/somehow misconstructed or "justified" later (God knows why this is a trope).