The propaganda is strong with this one.
The constant cheering on for japan, and the "we must protect japan from foreign invaders who are here to ruin our culture" gets overused here.
It's mentioned way to much and not portrayed in a clever way. They beat you into submission with it every single chapter.
If it was more implicit it wouldn't bother me as much but it's said by the characters as if to remind themselves what they are fighting for.