Serfs' Survival in Another World

It turned out to be just an ordinary office worker, and it turned out to be just an ordinary all-nighter. When he woke up, he found himself in the body of a serf named "Gavin". Before he could recover, a strange white mist swept over him. There were shouts from all around: "Adventurer, help me!" He thought: "An adventurer? He must be a very upright person! Find him!" After being thrown into the mouth of the wild wolf, Gavin finally realized: "What a bullshit adventurer! He is just a sinister villain!" ... Someone appears to be a mage with a broken sword, but what about behind the scenes? Gavin awakens the ability to absorb death energy, and begins an adventure in a fantasy world along the way!