Two can play the game. In the middle of the chaos between the basketball club, and most of the student council, the basketball club chose a wrong path to mess with the president. And that is, to use Rukawa to steal her heart for the sake of their club's downfall. What a wise plan, sounds like what Mitsui would resort...
Just as when she swore not to involve herself again with these troublesome basketball players, she realized she was so wrong to think that she can even avoid getting involve, because here she is, voluntarily accepting the offer to be Shohoku's medical manager, alas falling in love with one of their hard-headed players...