Yasaka = Japanese government (past)
Dad = Japanese soldiers
Mom = Japanese civilians
Daughter = Japan (future)
Apprentice = Japanese government (future)
Moral of the film the crime of WW2 will haunt the nation forever. Japan has no future. Population was attracted to power and almost betrayed the soldiers fighting WW2 (useless deaths rather than surrender). "Accident" in playground is the atomic bombing. Marriage between Dad and Mom was best when the future was frozen and the nation was clueless about the war crimes of the past (postwar recovery). But truth eventually came out. The apprentice can study the situation (draw it in the film) but not change it.
Moral of the film the crime of WW2 will haunt the nation forever. Japan has no future. Population was attracted to power and almost betrayed the soldiers fighting WW2 (useless deaths rather than surrender). "Accident" in playground is the atomic bombing. Marriage between Dad and Mom was best when the future was frozen and the nation was clueless about the war crimes of the past (postwar recovery). But truth eventually came out. The apprentice can study the situation (draw it in the film) but not change it.