Transmigrated into the 15th Century, Marin awakens as an exiled knight bearing only a horse, breastplate, and lance. Thrust into the era of German mercenaries under Maximilian I, he refuses to accept his fate as a wandering warrior. Leveraging fragmented knowledge from his past life, Marin constructs a formidable mercenary force from the ground up. His military campaigns devastate French knights and Swiss armies, positioning him as an indispensable power broker—emperors and kings themselves bend to his will.