Moldorian: Hikari to Yami no Sister

Once upon a time, there lived two races that lived seperately from each other aside from uncivilized monsters, "humans" and "demons". Humans lived on one end, tending to the land and living relatively mundane lives and demons lived on the other, strong with magical powers and willing to prove their dominance, though humans were rarely targets of their aggression. The world Moldoria acted as the boundary that seperated the two races and allowed each other to co-exist mutually. However, one day, while two mortals of the quaint village of Koizun, Nabal and Milia, are running simple errands and investigating the eastern woods, they witness a demon running through the woods. Uncertain of what this could mean, the two decide not to alert the townsfolk and investigate where the demon went, which is a hole in the woods. Milia stands watch while Nabal checks inside, but when he returns, Milia is abducted by a demon. Nabal alerts the town and his father, who goes out to search for Milia, but when he fails to return, Nabal decides to go himself, which is the start of his adventure as he interacts with various supporting characters while finding out why the demons kidnapped Milia and why the demons are now on the move.