I tried searching for the manga, but i can't found it (i probably missed it a lot of times when i was searching). It's been a long time since i last read it (more than 3 years ago), so i can't even remember one word of the title. I think it was a oneshot, but it could be a short manga.

It was shoujo manga, i think? But it could be shounen too. The MC is the male lead, not the female lead. He had a crush on the female lead and decided to confess to her/ask her out. But the thing is, he didn't know her real personality when he asked her out. He soon found out what kind of person the female lead actually is and was surprised. He (probably) thought that FL was a sweet girl, turns out she have a quite rough personality. Despite that, he still want to go out with her and then they started dating.

Like in many stories she started to warm up with MC and started to like him. She found out that he's in soccer club too. One day, when she's watching the MC practice, one of the soccer club senior saw her and approached her. He told her that he will let the MC joins the team if she agrees to break up with the MC and go out with him instead. Knowing how much the MC want to join the team, the FL agreed and start dating the senior. Later the MC found out about that and got mad. And as always, at the end they make up.

I think the MC have black hair, while the female lead has long blonde/pink-ish brown hair (not sure what's her hair color is, but it's definitely light color).

I hope anyone could help me find this manga. Sorry if my English is bad or it was confusing, hopefuly it's still understandable.

Edit: I've found it, no wonder it's hard to search. It's part of short stories collection Sekai wa Kimi o Sukuu!. The third chapter "My Sweet Heart".