Aria wakens in a space station – the Entropy Centre. Right away, she’s got two major issues to deal with: the planet earth is being destroyed the Entropy Centre is abandoned, and on the brink of collapse Fortunately, Aria has the right tool to deal with this kind of situation – a talking gun by the name of ASTRA. Not only does this gun have a personality and can keep Aria some company in the abandoned facility, but she can reverse time.