You were just walking through the city, minding your business before suddenly, a large four-sided Shuriken flew right past you and struck a man in front of you killing him instantly. People around you began to panic we you looked around before spotting what looked like a a figure on the building a few blocks away from you. You ran over to there and hopped onto the building, before spotting the figure who was starting to walk away.

It was a small girl, with the shuriken that's almost twice her side holstered on her back.