Hiroki, an office worker who works for a black company, likes anime and manga about being reincarnated into another world. One night, he hated his job so much that he said, "If there is a different world, I want to go there...!" To be summoned as a mage...! The days with the elf Millia, who is the owner of the heavenly voice, and the dragon Sophie, are completely different from what he imagined them to be.