Galo and Lio-hen are two 10 minute ONA(s) that are to be watched before Promare.
They both give a little background into the characters and world you will see when going into the film.
If you're a fan of Trigger/Gainax, you will hear some familiar voices.
As it's a 10 minute precursor to a 2 hour film, there isn't much story to be seen, just a basic scenario to see our characters' personality and how they react.
The art is pretty good, like really nice, and as of writing this i have not seen the film yet, but i assume that the art in this film is the
same as in the film.
Everything is colourful and nice to look at, and has a distinct Imaishi and Trigger/Gainax feel to it.
The character designs are good too.
There was about one track that got me going, but that was about it, the rest of the music and sound effects weren't very standout.
We get to see little snippets of character of the characters that will be in the film, but nothing big.
I enjoyed watching the shorts, and they got me very excited to go see Promare.
An good short to see before Promare, definitely recommend seeing these before watching it, if you have no interest in Promare, then there is no reason to watch these.