What is a true theme of this movie?

Rating: Null/10 (19 March 2016)

What is a true theme of this movie?
Bushido can often explain a peculiar phenomenon to Japan.
Bushido:Samurai Ethics and the Soul of Japan.
That's philosophy. And it's a foundation of the sense of values Japanese has.
e.g.
Why was "A Dog of Flanders" popular with Japan?
What was a theme of Evangerion?
What is a mistake of Seita?
This movie tells the people. "Do not forget the Bushido.You aren't supposed to escape from actuality."
Bushido cultivate the discipline of unbending spirit, planted endurance without a complaint. In other words, his aunt is right perfectly.