[Guido]

The more I immersed in this fantasy world the more I get interested to read about and know more about our real world's Western Medieval History.

Maou's plan to bring sustainable agriculture and food to all of the people sounds right. The most effective tool is education, because by educating the illiterate and less knowledgeable those people rise in the prominence of their intellects to contribute new ideas and participating in society.
Educating the poor and less fortunate has a big impact, because they coming from a background of misery and scarcity can greatly appreciate and value the impact of gaining knowledge to make it work into a system that's going to produce for the benefit of the overall communities, which in turn will positively reflect in the growth for both human and demons.

The only problem is that people coming from privileged backgrounds not always will agree to the newer idea proposed, or even they'll keep seeing the non-aristocratic folk as insects.
Let us also take turn that people coming from an illiterate and poor background not all of its members are going to agree to education, if they remained stubborn to something like old-fashioned convictions.

Fortunately, the key to education lies at teaching the youngsters like Maou is doing for those two sisters. They, in turn, will help other poor folks from their generation like themselves at educating them, thus perpetuating the cycle and making all communities to grow internally.


BTW, Maou and Hero make up for quite a natural chemistry among them, and they were just that tiny breadth of hair from almost kissing each other.