Yuka Nitta

Akio's little sister, she is unusually close to her brother, and somewhat childish besides. She enters Meisei under the pretense of spying for her brother but really is there to try to seduce Tatsuya into being her boyfriend. She is very good at observing and analyzing baseball players. Despite her bratty behavior, she is also a very good student who scores even higher in history exams than Sakata.