With a runtime of 168 minutes, the extended version is the longest animated film ever produced.
Distance from Hiroshima to Kure (where Suzu gets married and begin to live) is 20 kilometers.
More than 100,000 people were killed instantly by two atomic bombs dropped on Hiroshima (6.8.1945) and Nagasaki (9.8.1945) by US Air Force B29s.
Sunao Katabuchi's 3rd feature film.