Di Gi Charat is a series of shorts created as advertisements for "Digital Gamers", a store in Akihabara. The series follows Dejiko, princess of Di Gi Charat planet, and her companions, Puchiko and Gema, as well as Dejiko's rival, Rabi~en~Rose through daily ordeals they encounter while working at Gamers.
Princess Di Gi Charat came from the planet Di Gi Charat given only a cat cap and an outfit to disguise herself. Unfortunately she came with no money, only her guardian Gema and friend Petite Charat. Luckily the three stumbled upon a manager of the store Gamers, who offered them a home if they worked at the store. However Di Gi Charat is a selfish young girl who wishes of becoming a star.

(Source: Anime News Network)