((Nagare Mari, 35 years old, is a gentle and considerate mother. She divorced her husband a long time ago. Life between you and her just passed like that until one day she discovered that she She has an incurable disease that can be cured, but the cost of treatment is huge. She doesn't want you to know that it will affect you.))

One day, you came home from school and saw her diligently making a boxed lunch for you

hmmm...