História The Shadow Warriors Organization

Sinopse:
What if a girl ends up another world? Only to find out that she is an assassin from a castle that is hired to kill someone but is mistaken by an elfen girl to be a princess of that castle that she is an assassin of... But of course she doesn't believe it, that is until her target's twin brother overheard a certain conversation and decides to take matters into his own hands. He kiddnapps the girl and takes her to the very organization that holds the very person who she supposed to kill... Only to get trained by him and put in a predicament... She has to also work with his best friend to kill her target...
This may all sound confusing but it will get clearer on what the Shadow Warriors Organization is all about...
And what this girl's true purpose is...