everything

Here, at lorelei private high school, there's about only one rule to be remembered. " Kill or be Killed. " A cellphone was given to those that just enrolled. What's it for? In this school, when you're already check-mated and you have 0% possibility of escaping from the kill, this phone will ring.
" Any last words or regrets? "
But beware for if you answer, it will grant the exact opposite or your wish.
Now... What would you do if you were to enroll here?