Gunslinger Stratos is a brand new anime, set in a world where Japan is composed of two colliding alternate universes. One layer of the country is a sort of Japanese futuristic post-disaster Wild West, with advanced gun technology and a libertarian ethos. The other side is basically a prosperous futuristic Japan, but regions have become sovereign nations… and there’s a lot of totalitarianism and cronyism, and wars going on somewhere. People are disappearing from one universe to the next… or is it from one time to another?
The first frame of the anime is the following quote from St. Augustine’s Confessions, book 11, chapter 14, 17, along with a sound effect of a ticking clock:
What, then, is time?
If no one asks me, I know what it is.
If I wish to explain it to him who asks, I do not know.
(There’s also a small picture of Mont-Saint-Michel or something.)
The anime series is based loosely on a series of shooter videogames. In the games, both alternate universes are fighting a time war in the present day (2015 in the anime). Their agents are called “gunslingers.”