Just as the renowned writer Sensei is on the verge of fulfilling his lifelong ambition and committing double suicide with his lover Sacchan, he is struck by a truck and transported to another world. The local priestess Annette identifies him as an adventurer and assigns him the daunting task of slaying the demon king. Refusing to accept this new role, Sensei decides that his efforts are better spent searching for Sacchan, hoping she is somewhere in this new world. Early in his journey, Sensei encounters the martial artist Tama and unexpectedly saves her from mortal danger. Grateful for his actions, Tama decides to escort him. The pair are soon joined by Annette, who, captivated by the writer's strong personality, has sworn to protect Sensei's life. As the unlikely trio wanders through the dangerous, monster-infested lands, they soon realize that human beings might be the true threats to the peace of the world—and Sensei might be the only one with the power to stop them.