Japan, Our Homeland (2007) IMDb
Principally a musical, which is interesting, and as musicals go it is well made. There are two main problems: Unmotivatedly slow pacing where precisely one thing happens in a scene, and terribly ugly denial of the real motivations for and victims of WW2. It is offensive to suggest that the tokkoutai went gladly to their deaths because of children’s songs (douyou), as though the failed totalitarian government and peer pressure did not matter.
References here: “Don't mention the war!”.