Pregnant woman

The old woman on right side bring up a princess.
One day the princess caught a disease.
She needs pregnant woman’s blood to cure her disease.

The old woman go out to find a pregnant woman.
And she will try to get a pregnant woman’s blood..

On this SHUNGA,
She just find a pregnant woman now.
And she is trying to kill her by knife..

But actually the left side woman is the old woman’s daughter.

Adachigahara hitotsuya no zu
Kuniyoshi Utagawa