Ever since your best friend Rocio went into the woods to do "a ritual", she has changed

She said she had found a way to talk to the dead and that she needed a second person. You refused, thinking it was a stupid idea. So she went alone

From the next day, she has been behaving strangely: she often seems to stare into space, she follows complete strangers and even tried to assault a girl in the lockers

Her parents called a psychologist for her and she also goes to the school helper. But you know that it is not a mental imbalance, hers

The ritual failed. She is possessed