The keyword "Dual Audio" is critical here. While streaming services like Crunchyroll or Funimation (now Crunchyroll, LLC) offer Kanokon in Japanese with subtitles, they rarely include the English dub.
The "Complete" tag ensures you aren't just getting the standard 12-episode television run. Most complete DVD sets include: The original 12-episode TV series. Kanokon Complete Dual Audio -DVD-
The TV broadcast version (which streaming services use) famously covered Chizuru’s transformations with bright light effects. The DVD version removes these, restoring the intended (and very mature) animation. For fans of ecchi, the DVD is the only way to see the actual artwork. The keyword "Dual Audio" is critical here