Double-J is a comedic mini-series focusing on cultural heritages; it had an average/good art style and the ED was really catchy and fun, the jokes were hilarious and were superbly executed. The characters were very enjoyable and I really enjoyed the show. On the other hand it is still a mini series, and mini series lack story, though it can be overlooked as Double-J is meant to be funny and does not really require a story. Overall, it really was a good anime. I recommend you watch it if you don't mind wasting two episodes of that anime you're watching as the whole Double-J animeonly runs for about 25 minutes(without OP and ED) or so.