She will die single and a virgin because she didn't won the race back in high school and never recovered
If she hadnt gotten over Haruo, she would have never backed him up against Akira's Mother. And much less had gotten that miraculous perfect Víctory against the Mother just to force her to accept Haruo as Akira's lover.
Even if she not love haruo anymore, he is one of the most important ones in her life. Not only her first love, but the one who presented her the world of arcades and games, which gave a new sense to her life. So its normal for her to remember him.
Koharu is still single and Virgin just because she still hasnt found a Man worthy of her. Why would that be a problem? Why would she just have sex with a random guy just because thats "what she should have done"?.