Yotsuya Yuusuke along with his classmates Shindou and Hakozaki have been transported to a strange and unknown world inhabited by mythological creatures. As soon as they arrive, they meet somebody calling himself the Game Master who then grants them a time-limited quest. To aid them in this quest, he also bestows Shindou and Hakozaki with the roles of a Magician and a Warrior while Yotsuya is randomly granted the role of... a Farmer!? This is how a hectic life of adventuring began for three students who now have no choice but to complete the quests for several phases in the fantasy world if they want to protect the real world from the demons and monsters they encounter.