This is simply a special episode featured in the blue-ray version of "Ganbare Douki-chan" and as such it's just a filler episode and pretty skippable if you wish to do so, however it follows the basic blueprint of the main series so if you enjoyed that it's more content and having in account the fact that the episode is only five minutes I don't see why not watch after watching the main show. As usual of these blue-ray special fillers it has a bit more ecchi than the usual episode but nothing too outlandish. I usually separate my reviews by plot, art, etc but sincethis is a 5 minute filler episode I don't see the point in doing so since I would just be repeating my review I did on the MAL page for the anime. I would personally recommend this episode since I found it enjoyable and it takes only 5 minutes of your day, but I know a big part of anime watchers don't care for fillers and are only interested in plot relevant content so if you recon you belong to the latter group than I see no reason you would want to watch this.