In another world, a magical summoning is attempted, but an assassin attacks, corrupting the spell. On Earth, two Japanese students named Taichi and Rin are suddenly caught in a magic circle and transported into the other world. A monster horse attacks them, but a trio of magic-wielding adventurers come to their aid and kill it. Inspired by them to become adventurers to make a living, Taichi and Rin are escorted to the city of Azpire, where they attempt to register with the Adventurers Guild...