100-man no Inochi no Ue ni Ore wa Tatteiru

Yusuke doesn't care about getting into a good high school. He just wants to get away from people and make it home to his video games. But when he suddenly finds himself in a real-life fantasy game alongside his two gorgeous classmates, he discovers it's not as easy as he thought, especially when there's a headless man "from the future" assigning him missions and his character class is... farmer. Before long, the unlikely trio find that they're not just battling for their own lives, but for the lives of millions!

(Source: Kodansha USA)