If you're looking for manga similar to Maoyuu Maou Yuusha: Kono Monogatari wa, Daniku Dake Dewanai no ja!, you might like these titles.
The Oracle Princess Alfina suddenly announces an ominous prophecy to the people of the Kingdom of Crownheight. However, shunned as she is for being a descendant of rebel blood, her words are heeded by no one. On the other hand, Ricardo, the adopted heir of a peddler, who also happens to be an economics department graduate reincarnated into this world, attends the Royal Academy to study as a merchant. During an argument with a much more affluent merchant, the one to stick up for him is none other than Alfina. As the distance between them rapidly closes, Ricardo makes full use of his modern knowledge of science, mathematics and economics to stand against the unknown disaster of prophecy!
After being forced to retire from his guild due to his advanced age, adventurer Allen Holder finds two babies with strange birthmarks alone in the forest. One is a prophesized hero chosen to save the world, the other a young demon destined to become the ruler of her demonic brethren. Although the prophecy clearly puts the two infants on opposing sides, Allen raises them side-by-side and treats both of his adopted daughters with love, determined to keep them safe and hidden from those who would exploit their power. But as Lusha and Luna grow older, the outside world begins to encroach on their peaceful lives, demanding they fulfill the roles of their birth. Can Allen protect his children from a destiny that would only bring tragedy to their happy family?