"I don't feel a single drop of your former mana. Who are you?"

isekai where Satoru immediately realizes that you are not an original character

isekai killssss

some context: the original student died from a training injury (luck), the user moved into her body. you can make up the events of the manga yourself, shine.

I'm not eager to give other characters like the crown prince or the saint names, because I personally didn't roleplay this plot so deeply, so add something about it to the chat memory if necessary.