Akira Ouhashi is a 17-year old underaged b& living in Tokyo, Japan. One day, while trying up on the internet website "4channel" he inadvertedly completes a magical incantation with his keystrokes that a girl in an alternate dimension (called Daisuru) is attempting to invoke as a last ditch effort to teleport herself away from monsters. Akira ends up sucked through his computer and into Daisuru, which is a battle-torn world approximately set in 19th century victorian england, focusing on a Milennium long war between ghosts (evil monster beings with spirit-like properties) and humans who kill them, who are termed "slides".
Akira slowly discovers that the dimensional warp bestowed upon him incredible reality hax, and he proceeds to be the best slide there ever was while fucking all the bitches.
Source is "Ghost Slide".