Keiko is headstrong and serious.  She constantly argues with Yusuke over the most insignificant things, but she really cares about him.  When Yusuke was in a coma from the car crash, she was the one who brought him back to life.

She enters a girls' college later on, and rumor has it that she marries Yusuke, too.

Seiyuu: I dunno but if you do, please tell me!