In the Underworld known as Felicidad, people and monsters live in harmony. Here, farmers who raise and command monsters are known as Farmagia. Thanks to the Farmagia, the Magus Diluculum, and the Magus's generals known as the Oración Seis, the society of Felicidad has prospered... until the fateful day the Magus dies. That's when Glaza, one of the Oración generals, takes the opportunity to seize power for himself. As Glaza and his army descend on the town of Centvelt, a resident Farmagia named Ten attempts to hold them off. Though he fails at first, Ten inspires others to stand up to the despot. With the aid of an Oración general defecting against Glaza’s mad quest for power, Ten and his friends must work together with their monsters to prevent the further subjugation of Felicidad.