"Plunderer" is set in a post-apocalyptic world where society is governed by a system that assigns individuals a number based on their "Count," which represents their worth or achievements. These Counts can increase or decrease based on actions, and if a Count reaches zero, the individual is sent to the Abyss, a mysterious and feared place. The Counts are tied to specific objects, such as a soldier's kill count or a baker's bread count, and are displayed on their bodies.

The story centers on Licht Bach, a legendary figure known as the "Red Baron," who hides his true identity behind a carefree and perverted demeanor. Licht's Count is tied to the number of women he has kissed, and he wields a powerful sword. His journey intertwines with that of Hina, a young girl searching for her missing mother. Hina carries a special Ballot, an object that allows her to challenge the Count system, and her Count is tied to the distance she walks. Together, they navigate a world filled with political intrigue, powerful adversaries, and the mysteries of the Abyss.

As the narrative progresses, Licht and Hina encounter a diverse cast of characters, each with their own motivations and struggles tied to the Count system. These include Jail Murdoch, a disciplined soldier with a tragic past; Lynn May, a skilled fighter with a mysterious connection to Licht; and Pele Poporo, a cheerful inventor. The group uncovers deeper layers of the world's history, including the origins of the Count system and the true nature of the Abyss. Conflicts arise as they confront the ruling class, known as the Aces, who manipulate the Count system to maintain power.

Themes of identity, justice, and rebellion are explored as the characters challenge the oppressive structures of their society. The story balances action, mystery, and emotional depth, with revelations about Licht's past and the world's history driving the plot forward. The interplay between the characters' personal struggles and the larger societal conflicts creates a dynamic narrative that keeps viewers engaged. "Plunderer" combines elements of fantasy, science fiction, and drama to deliver a story that is both thought-provoking and entertaining.