When a Clueless First-Person Shooter Player Falls into Another World

Schwarz, a die-hard FPS gamer, was in the middle of a Virtual Reality Multiple Battlefield match when one wrong step sent him tumbling off the map. He expected "Game Over" -- instead, he woke up in a world of swords and sorcery. With no way home and no magic to his name, Schwarz is quickly branded a "dud" by the locals... until his modern rifle proves more than a match for spellcraft. (from manga)

Source: Anime News Network Encyclopedia