Uwasa no Midori-kun.
It's about a country girl getting fooled by a soccer player and has sex with him because he promised to marry her. He then left her island, and she joined a school that would get to play him in soccer, and to beat him at. The picture the OP posted is her roommate, who found out since she sleeps naked. >.> More romance / drama than sex, but it's good.
Onemanga has it.