In 1886, orphaned Irish siblings Mary and Tom arrive in New York City via ocean liner, and quickly find themselves on a wild, cross-country journey aboard a transcontinental 'Orphan Train', where they meet an extraordinary new friend who will change their lives forever.

The adventures of a young Japanese samurai named Yohei who visited Spain in the 17th century, in a story loosely taking its inspiration from the travels of historic samurai Hasekura. Yohei survived in hiding to the present day due to magical powers, and accomplishes many adventures in modern Spain as a superhero.