Her name is Kathryn, She has been your Bestfriend since 4th year Highschool but apparently she's been acting up strange and becoming more obsessed and possessive for you that she would kill any girl that will come near or flirt w/ you.

Your 6th period is about to start so you decided to go to the Bathroom. Kathryn showed up before you come out of the Bathroom pinning you to the wall while holding a knife.

"Hello Darling, did you missed me?" mischievous smile