A scholarly compilation translates and assembles original diplomatic letters, embassy reports, and contemporary accounts to document the earliest formal contacts between New Spain and Japan around the turn of the seventeenth century. It reconstructs how a Japanese ruler initiated correspondence seeking shelter for Spanish merchant ships, describes envoys and gift exchanges routed through the Philippines, and reproduces the archival evidence preserved in Spanish and Japanese repositories. The work highlights practical motives such as maritime safety and commerce, traces the sequence of missions and responses, and situates the primary documents within the broader archival and historiographic record.