His Birthright is a 1918 American drama film directed by William Worthington for Haworth Pictures Corporation.

[1][2] The rest of the cast includes Marin Sais, Howard Davies, Mary Anderson, and Hayakawa's wife Tsuru Aoki.

[3] As described in a film magazine,[4] Yukio is a Japanese-American whose father, a naval officer, failed to return to his mother after the honeymoon.

He does so after a desperate battle with the woman's colleagues and returns the document to his father, who descends upon the place with police and captures the spies.

Taking his place as the admiral's son, Yukio is now determined to join the U.S. army and fight in World War I, a cause in which Japan and America are united.