Lydia Kodzure Madoushi no Bouken (V1.01) (RJ01233374)

The main character, Lydia, was a magician who once defeated the Demon King together with the hero Brent.
After the battle, Lydia married Brent and had a son, Alan.
However, some time later, Lydia’s husband Brent fell ill and passed away.
She ran a pharmacy in the village with her son Alan, but one day a mysterious girl appears before her.
The girl’s true identity is the Demon King, whom Lydia and her friends were supposed to have defeated.
The resurrected Demon King places a curse on Alan and leaves.
Lydia’s adventure begins in order to lift the curse on her son and protect the world from the Demon King…