About the Brother Turning into a Demon Girl

[Marriage change]+[Pure love]+[Reincarnation]+[Daily] According to ancient books, this world is divided into the human world, the demon world and the divine world. But what does this have to do with ordinary people like them... Wait, what does it mean for a brother to become a demon girl? More and more troubles follow, kidnapping, fraud? What exactly happened that year? More and more old events and truths are gradually coming to light, and their lives will be changed due to these changes...