On the eve of the college entrance examination, my adopted sister said she was reborn

Summary

The day before the college entrance exams, my adopted sister suddenly announced she had been reborn.

Apparently, in my past life, I failed the exams, had a psychotic break, and murdered our entire family in a blind rage.

She was here to save us all.

My parents believed her. They locked me in my room and cheerfully sent her off to take the exams in my place.

I screamed for help out the window until a neighbor finally called the police. I managed to rush into the exam hall at the very last sec