There is one heroine only, no harem.
A truck sent me to a parallel world, and I discovered that this world is a little different from mine.
How did I end up switching bodies with my cold-on-the-outside, warm-on-the-inside deskmate?
Why do I have an adopted older sister whom my parents took in?
Why does the me in this world have a different kind of relationship with my childhood friend?
Why have I dyed my hair blond and started riding a scooter?
How can there be things that science can’t explain?
Why is this affection-level System completely useless?
I’m Chovy. If I had to transmigrate, couldn’t you have sent me somewhere better? What is all this?
The affection-level System is only useful early on. It’s barely used at all in the middle and later parts.
The male protagonist is so insensitive that he didn't realize that he had traveled through time for a long time. The male protagonist continued to pretend for a long time after being discovered by the original owner's sister that his body had been taken away from him, and he didn't know what the point of still pretending was. Some kind of curse or some kind of backlash from heaven appeared halfway, and I was really dead. I think the "what does it mean" in the title should be used on yourself.
The story is pretty good, but it's hard to read in the first person.
Do you use punctuation marks?
Very pretty, is she single?