Di Gi Charat Theater Vol 2

From the Broccoli Books edition

The Black Gema Gema Gang are from Planet Analogue, and due to their poor resources they have been trying to conquer planet Di Gi Charat for years. Upon learning that the Princess Di Gi Charat (a.k.a. Dejiko) went to Earth, they quickly follow to kidnap her and hold her for ransom to support their home planet. Features over ten stories by some of Japan's most talented manga artists, including Koge-Donbo ("Di Gi Charat," "Pita-Ten") and Kanan ("Galaxy Angel")! Complete with character profiles, translation notes, and behind-the-scenes articles/interviews about the Di Gi Charat world!

Source: Anime News Network Encyclopedia