As an awkward new student at the prestigious Lillian Girls Academy, Yumi Fukuzawa is thrilled, but nervous, when Sachiko Ogasawara, one of the coolest kids in school, offers to be her "big sister" in this charming anime series. Sachiko helps Yumi find her footing in the school, and the newcomer discovers that there's plenty of behind-the-scenes drama spurring the older girl's decision to act as Yumi's guide and mentor.