Kazuma Satou expects adventure from a new life in a fantasy world, not the need to work for his living. A reclusive high school student, he dies an embarrassing death while returning from buying a game. The goddess Aqua then offers him a choice between heaven and reincarnation, and he opts for the fantasy world.
His assignment is to defeat a Demon King terrorizing villages. Allowed to select any one item to help him, Kazuma picks Aqua herself—but the goddess proves useless as a companion. With living expenses to cover before they can pursue a thrilling adventure, the pair discover just how different their circumstances are from the games Kazuma knows.