From publisher blurb:
The Grand Stair stretches behind the scenes of the multiverse,
The Doors upon its unfathomably vast span leading the way to gossamer worlds of limitless variety and infinite possibility. There are infinite possible Earths, and this one is in some serious trouble.
Incursion Earth 626 is one of these infinite possible Earths, forever transformed by a disastrous flood of psychic energy which turned the world on its head and made dangerous super-psychics out everyday people – much to their confusion and peril. As if that weren't bad enough, then evil spirits known as yokai rose from the ancient past and the futuristic alien technocracy known as the Incursion invaded, harvesting psi-active humans for their own sinister experiments. Set upon from the skies above and the shadows below, humanity still hopes for liberation, preparing for the day when they can liberate the Earth.