It's a collector's item consisting of a special DVD packed with extras, and a Box to house all four volumes of the series. The DVD contains a music clip(s) featuring the performance by Alien Taisaku Musume, event footage, interviews, textless intro and outro (with 4 alternate soundtracks for each), OVA promo footage, TV commercials, and a footage(s) featuring the 3 popular voice actresses from the show's main cast!