The slick music is a flaw. It's a pity that traditional Japan music can't be adopted in movie about modern affair. Music sound tedious in a repeated oppressive rhythm, as well as the cadenced music that helped to arose the urgency condition. Perhaps better without the background music.
Having watched some Japanese WWII movies. The common narration was: graceful landscape and relics in motherland, dear family members or lovers --everything in country is so beautiful, and all these should be cherished; be forced to frontier; found be cheated by warlord (only when defeated?); but, in any way, soldiers should behave braveness and obedience (approve the real Japanese soldiers' behavior in late stage of WWII); at last, somebody sacrificed for their honor, the survivals represent the hope of new Japan.
-- All above in the service of such a mention: the own country is the core, in other words, Japan is the most important. It seems most Japanese turn a blind eye to other nation's suffer, and addict themselves to their own perception. People in occupied territory means nothing, and if they does, they should appreciate the occupiers from the same Asia for their 'liberation' from Westerners. Defeat is not reconciled to -- 'Go down swinging'. If plot not be treated so, the nation's 'self-pride' would hurt. Sometimes, remorse or condemn to warlord are allowed, in an delicate 'apropriate' limit, but it wouldn't account for the main line. Scenarios must be turned around thereafter anyway. Perhaps someone responsibl for movies partially realized the fact, but they just wouldn't recognize it.