If you finished Grenadier and want more material, you can easily watch this special. Each episode is one minute and a few seconds, it's animated and presents some funny scenarios from the main show. Some scenes here are parodies of the anime and I can say that I found it hilarious. Have no worries because we have some sexy scenes also, nothing too extreme though, just the right amount of ecchi with Rushuna and the other girls. I recommend to be watched after the TV anime because it has inside jokes from episode 12. Overall, a very fun watch and I enjoyed it, unfortunately it's too shortfor how I prefer this type of omake, blink it and you lose it.