After My Transformation, the Person Taking Care of Me Turned Out to Be the Reincarnated Demon King

[Gender Change + Marriage Change + Pure Love + Fantasy + Everyday Life] An accident turned Lin Yu into a girl, and she also came into contact with another side of the world. The first thing he saw when he woke up was a witch from another world. The perpetrator and savior was the reincarnated devil king. What happened? Traveled through time? After figuring out the situation, things were worse than she imagined... This is a story about "What should I do if I become a girl and find out that my roommate seems to like me? I have to wait online in a hurry." It is also an adventure story about the power of gods, the inheritance of the Demon King, and the conspiracy of the Dragonborn.