Uruka will be the first to confess, but knows she won't win because she will be gone overseas and get some closure. That being said, it's also possible that she doesn't leave until near the end of the series and comes back after a final chapter timeskip where they officially get together. After all, he has shown the strongest feelings for Uruka over all the girls, so it's possible. Fumino is too late in the game for the reasons I mentioned before. She's a support main heroine and has been playing that role this whole time. Support girls have very rarely seen the finish line. Rizu is still a contender, but overcoming the father is also detrimental. Then again, there's been hit-and-miss cases where that kind of girl is the winner, big breasts or not (let's be real, her breasts have only been a comedy plot device anyway, not a charm point). Kirisu is out for the painfully obvious reason that she holds no romantic feelings towards him, but is codependent of him due to her secret. Asumi is also a contender, but unlikely due to her teasing nature. Teasers almost never win. She also has the handicap of lying to her father and being older. The father can be overcome, but it's extremely rare the older woman, even slightly wins. So really, the real contenders are Uruka, Rizu and Asumi (in that order) while the others are red herrings