Death March to the Parallel World Rhapsody, Vol. 1 (manga)

Suzuki thought he was dreaming when he took a nap and woke up in a fantasy world, but this programmer has found he now has special powers straight out of his game.

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Suzuki is a programmer in the midst of a death march-crunch time, when coders live on caffeine and pull twenty-hour days. He just needs a little nap...but then he has a dream. A dream where he's in another world, with RPG powers right out of his game. A dream where he calls down a great disaster. A dream that, suspiciously, just won't end...