In the 1400s raging wars between two emperors is being fought. This is not about the wars, but about the poor people struck by it. In a rural location camouflaged by a huge field of tall reeds are two huts. In one of them a young woman lives with her stepmother, her husband went to war. Having had failed crops three times that year they are stricken by poverty. The only way for them to survive is to steal, and the only things to steal are uniforms and swords from dead soldiers or heavily wounded soldiers and then sell them to the underworld. Which by the way is funny, I never thought of the underworld in rural medieval setting before.
This story is just as grim as the demon on the cover. The wind howling in the reeds make for very creepy atmosphere. The music consisting of drums and brassy wind instruments really intensifies the drama.
Just as in sand in Teshigaharas equally excellent 'Suna no Onna' serves as symbol, metaphor and is very important in creating atmosphere we have in 'Onibaba' the tall reeds.
The theme in this, the basic needs and emotions of people, will never be dated. The psychology is thick and real. They are victims of their leaders actions. With all the wars being fought today this is still happening today, please remember that.