Story: 8
True to all the anime its draws from, Isekai Quartet rises above simple fan service with its own unique mystery and story.
Characters: 10
The characters of Overlord, Konosuba, Re:Zero & Youjo Senki are arguably some of the best parts of those shows, all being richly developed with their own personality and quirks. Isekai Quartet does a fantastic job of using all that character development and building on it. A lot of the humor in Isekai Quartet relies on references and character development from the original animes and honestly I find it really fascinating to see how characters from the different anime interact.
Art: 7
I don't really care for the chibi designs, but I can understand its use as trying to blend the 4 different artistic styles from the 4 source anime would be down right impossible. That being said, you shouldn't be watching this for the art.
Sound: 10
Isekai Quartet sports all the original voice actors and actresses from the original animes, and a good number of them even sing in the opening and ending which is really awesome. Sound quality is nothing short of what we expect from the source animes.
Enjoyment: 10
Like I said before, seeing all my favorite characters from dealing with this unexpected situation and interacting with each other is really interesting and hilarious. I enjoy watching Isekai Quartet immensely.
Overall: 9
I never expected a crossover like this would ever be made, but I'm so glad it was! It totally satisfies my craving to see more of my favorite characters until more sequels for Overlord, Konosuba, Re:Zero & Youjo Senki are released.
