Reincarnate Into Multiple Personality/Alter Ego Reincarnation

I was a university student, and I loved reading manga. But one day, everything changed.
I was killed in a car accident. When I woke up, I found myself in a different world. This world was full of magic and wonder. I didn't know who I was or how I got here, and I couldn't even control my own body.
I investigated who I was, and I knew that I had become an alternate ego of the main character in a manga world who had a tragic