Kazuma Satou lives a laughable and pathetic life, being a shut-in NEET with no distinguishable qualities other than an addiction to video games. On his way home, Kazuma dies trying to save a girl from an oncoming truck—or so he believes. In reality, the "truck" was a slow-moving tractor, and he merely died from shock.

Waking up in limbo between death and heaven, Kazuma finds himself facing the arrogant goddess Aqua. Here, he must choose between two options: go on to heaven or be sent to a fantasy world that needs his help to defeat the Demon King. Initially unimpressed by the challenging prospect of fighting a Demon King, Kazuma changes his mind after Aqua tells him he can bring any one item he wants. What better choice does Kazuma have than the goddess standing before him?

Unfortunately, after the two arrive in their new world, two things become clear: Aqua is useless beyond belief, and life in this fantasy realm will be anything but smooth sailing. From paying for food and accommodations to trying to learn new skills, the duo's problems are just starting to take shape—and the arrival of eccentric allies may only make things worse.