Well first of all, i am not really good in english so i'm gonna do my best, i hope you can help me, but i'm not sure if this is really a vocaloid song, i think it is.
I only remember what happening in the video, this is the story of a little girl who kill and steal in order to survive, one day a knight ( who's really strong ) find her after killing lots of bandits. He teach her how to use a sword and they travel together for some time. One day in a city the girl see a beautiful sword, she is about to steal it but the blacksmith stop her and she use the sword to cut him down, the knight who fight for justice ( i think ) raise his sword against the girl to stop her, she kill him and leave the city.
This is all i can remember, this was one of the first vocaloid's song i ever listen.
Thank you for taking the time to read this post.