In the modern era, unexplained alien species—monsters—have begun to emerge.

There are no struggles to save the world, no battles to keep hope alive, no bloody wars for survival; instead, the threat has been relegated to an everyday level.

However, people's ways of life and societal structures remain unchanged, and a new industry dedicated to alien species extermination has been born.

The emergence of new industries and contractors naturally fosters new economic growth, but concurrently, a great many foolish individuals also appear.

In attempts to salvage businesses plagued by persistent deficits, contractors often undertake reckless jobs, frequently resulting in major accidents and human-caused disasters.

The protagonist, Arano, is one of the few survivors of that company, and ever since its collapse, he has continued to perform exterminations by himself.

※Also serialized concurrently on Kakuyomu