A young boy named Alva lives as a slave, spending his days hunting monsters. He is forced to fight battles that bring him to the brink of death, but through these battles he steadily grows stronger, defeating countless enemies despite being cursed with a weakening effect. No matter how cornered he is, Alva manages to survive, and the kingdom is desperate to kill him quickly. One day during this battle, Alva meets a lizard. This encounter will completely change his hopeless life as a slave