Short Answer: If you have played and liked the Gravity Rush games and want to see more of the characters, just watch this. You'll probably like it and its only 19 minutes long. If you have never played the games or don't particularly care for the characters then there's really no reason for you to watch it.
This short animation was a nice connecting episode linking the two Gravity Rush games, and providing a little fanservice to the fans. It was released before the release of Gravity Rush 2 as promotional material. You get to see more of our favourite characters interacting with each other, which
is great because the characters in Gravity Rush are great. You also get to see how things ended up the way they are at the start of the Gravity Rush 2 game, which is nice because not everything gets clearly explained when you start it.
This episode is actually made up of two mini parts.
Part A is fairly boring in my opinion. It's pretty much just a 5 minute fight between Kat and some nevi, which I wasn't particularly interested in. The fight animation was pretty enough, though at the beginning you get to see some of the worst walking animation ever. There are a couple of nice character interactions between Kat and Raven through dialogue during the fight too, but overall part A doesn't really do anything or add anything to the Gravity Rush narrative. It simply exists to promote the new game and say, "Look! It's Kat! You should look forward to her new game! Have a short animation!" It also serves to briefly show you the setting of Gravity Rush 2 as it seems to take place partway through the game.
I enjoyed part B more. The first couple of minutes are really nice. You get to see how close Kat and Raven get after the end of the first game. Theres some entertaining banter between the two in Kats house, which I love because my favourite part of the games were the characters. Then the episode starts to develop the mystery which builds up to the second game. It managed to get me invested in the short time the episode has. The part is rounded off with a nice fight scene (which I enjoyed much more than the pointless nevi fight in part A) and the episode ends on a cliffhanger. To find out how any of the plot of this is concluded, then you'll just have to play the games. Its pretty much just a mini prequel for GR2.
In conclusion, its not a narrative masterpiece; what little story there is is barebones and just serves just to set up the stage for Gravity Rush 2. I like it because it gives you more of the characters we love. If you enjoy the games, whats there to complain about a nice little bit of extra content given in the form of a promotional episode. May as well give it a shot
I recognize that this is completely biased, but Gravity Rush is my absolute favorite fictional franchise and I can't help but praise it.
The GR franchise is pretty niche in America, but sells well in its native Japan.
Gravity Rush Overture bridges the gap between GR1 and GR2. And it continues the complicated, but masterful storytelling of the two games it is bridging between. You will notice a lot of stuff you didn't see beforehand if you rewatch this after playing GR2.
Kat is the greatest character in all of fiction (my humble opinion). Kind and
generous to a fault, and will obliterate you if you get in her way. Her and Raven's day-to-day relationship is expanded upon in this short, as well as her interactions with Syd. They're all unique, and Raven's development from seemingly cold hearted and single minded person in GR1 to where she is in the short is impressive.
GR is praised for its soundtrack, composed by the talented Kohei Tanaka, and this short is no different.
GR is extremely overlooked, and I beg you to buy Gravity Rush Remastered and Gravity Rush 2. Beat the first game, watch this short, and then finish GR2 and the Raven DLC. Rewatching this short will tip you off to a lot of things you may have missed before your playthroughs.