Kazuya is the star player of the Sei Hanazono Gakuen Junior High soccer team. Momoko, Yuri, and Hinagiku all have crushes on him, and all want to get close to him. (Can you really blame 'em?) For the sake of humor, it doesn't happen. And for that, we can thank....
Yousuuke is the goalie on the Sei Hanazono Gakuen Juinor High soccer team. He interferes in the girls attempts to get anywhere near Kazuya, so as not to distract him from playing soccer. He and Momoko eventually grow fond of each other. (But you'll never get either of them to admit it! ^^)