A historical novel about a samurai ordered by his lord to cross the Pacific with a letter for the Pope, traveling through Mexico, Spain, and Rome. Guided by the missionary Velasco, he returns after a long journey to a homeland turning toward the prohibition of Christianity and national seclusion, where his life is shaken between politics and faith.

After a seven-year journey, the samurai returns to a homeland engulfed by faith, power, and political change.