There was a glorious era called "magical science civilization".Until the cataclysm later called "Ragnarok" swallowed the world.Thousands of years have passed, and the threat of Ragnarok has become a distant memory. Kei and his childhood friend Alisa accidentally discover a lost item called a "device"in the depths of the ruins of the magical science civilization era . The two who touched the device were led to another world, and were destined to become "successors" to save the crisis of world collapse!?