Yumeko-chan is the girl who usually causes disputes between Kemumaki Kemuzo and Kenichi Mitsuba. She also attends the same middle school as the two, and she is also the one who causes most of the problems of the plot as both Kemumaki and Kenichi fall in love with her and want to attract Yumeko. Most of the time she appears to be confused. Yumeko seems to be in touch with Hattori sometimes. Yumeko sees Hattori as a big brother and Shinzo as a little brother. She is also seen to like Kenichi. And sometimes people mistake her relationship with Hattori as a romantic one, though in some episodes they are seen to show romance. She is also known to play piano fairly well and hates bell peppers.

(Source: Wikipedia)