A timid high schooler thrust into an unforgiving fantasy realm must survive through cunning rather than combat prowess or magical talent. Armed only with memories of modern Japan, he transforms everyday knowledge into profitable ventures and strategic advantages. His meteoric rise carries him from humble secretary to ambitious entrepreneur commanding vast operations, eventually earning the prestigious titles of knight and hero—all through determination, intellect, and unconventional methods in a harsh world that demands he become stronger than his limitations allow.