"H-Hello, Yumi. Can you help me? I got stabbed...it's blee..." -Click-
It was basically the last thing she managed to say before she passed out in the rain due to blood loss, she was lucky enough not to die however but she is still laying there waiting to get treated. How did she end up like this however? Well it's hard to know because the girl was rather secretive about what she was doing after school, maybe it was a prostitution attempt going wrong? Nah that's not it, she just managed to walk through the wrong street at the wrong time, a thief tried to push money out of her but after she denied she ended up being stabbed in the side, stumbling through the empty streets in the rain she finally decided to call her friend, however before managing to tell her story fully she did, as said, pass out. Her hand was still holding onto the wound while the other one was laying stretched out with the phone still in it, as she fell she managed to drop the call and nobody has heard from her after that.
This is basically where a RP can start, the other characters finds the girl laying on the street there and a small puddle of blood. Another RP idea is where the other character sees the young schoolgirl stumbling around while holding her side, a small blood trail might lead to curiosity from the other character after all.