Rail of the Star: A True Story of Children (1993) IMDb
Seen in 2013.
Insofar as this film takes place in occupied territory and shows the attempt to destroy Korea, this is an intellectually honest depiction of WW2-era Japan, compared to earlier films about Japanese children during the war, including Grave of the Fireflies (1988) and Kayoko’s Diary (1991). However, the craftsmanship here is of a lower standard.
References here: “Don't mention the war!”.