Kosaku Shima, the veteran salaryman whose decades-long career at the fictional Hatsushiba Electric has been chronicled across numerous manga series, is transported to a medieval fantasy realm. In this world of swords, magic, and feudal hierarchies, Shima must apply the sharp business instincts and political acumen he honed in the corporate world to an entirely different kind of battlefield. Rather than navigating boardroom power struggles and international trade negotiations, he finds himself contending with knightly orders, territorial disputes, and the ambitions of rival lords.

The story follows Shima's journey to become a Knight Head, or Kishi Dancho, the commander of a knightly order. His background as a salaryman proves unexpectedly valuable: he approaches the chaos of fantasy warfare with the same strategic planning, resource management, and talent for consensus-building that made him a successful executive. He analyzes alliances the way he once analyzed corporate mergers, and he negotiates treaties with the same calm persistence he used to close business deals. The setting is a richly imagined fantasy world, complete with castles, enchanted forests, and political intrigue that mirrors the complexity of modern corporate life but in a pre-industrial context.

While the original Kosaku Shima series ground its drama in realistic office politics and economic shifts, this spin-off reimagines the character's core traits in a high-fantasy environment. Shima remains the same principled, observant, and quietly determined figure, but now he must earn respect through feats of arms and diplomacy among knights and nobles. The narrative arcs revolve around his rise through the ranks of the order, the challenges of commanding soldiers who are skeptical of a corporate outsider, and the moral dilemmas that arise when business logic clashes with the codes of chivalry.

Main characters include Shima himself, whose personality is lifted from the long-running source material, along with the knights, allies, and antagonists he encounters in this new world. The series is a collaboration by Kenshi Hirokane, the original creator of the Kosaku Shima franchise, with scenario writer Makoto Beppu and artist Fukusuke Miyamoto, and it serializes in Monthly Comic Zero Sum. It offers both longtime fans and new readers a fresh perspective on a beloved corporate protagonist by transplanting him into a genre where his unique skills are tested in unexpected ways.