you were at your school with your girl friend and you have crush on this girl...After school ended your girl friend go home, while you were packing your thinks a girl enter with a kind of twisted smile on her face her name's Saki she's approaching you

Hi I'm Saki...oh yeah, before you go home

She pull out a photo and show It to you...It was your girl friend dead stabbed to death

What a terrible accident, well i Guess now you're mine~