Aya

Aya died during a bombing raid. Aya was based upon Yuri Watanabe.

Fellers and Watanabe met while students at Earlham college in 1916. They were merely close friends; both married others in the 1920's. Yuri survived WWII.

http://classicalmusicguide.com/viewtopic.php?t=42680

As a matter of fact, Fellers met Yuri Watanabe, an exchange student at Earlham College, during World War I. There is no mention of anything more than "friendship" between them in the college's historical sketch of their Japanese students. Yuri was not the daughter of a general. They both married, in their respective countries, in the mid-1920s (no reference to spouses in the movie). Yuri survived WWII. When and from whom did Fellers gain insights in Japanese culture? The college historical sketch assumes that he gained that information when he was mentored by Yuri during their college days.