I really hate you but I think I'm in Love with You

Lucy Nohara is the younger twin sister of Rin Nohara. Having fallen for Obito, her childhood crush, she soon realises that she's no more than a shadow from the past, a support character in the back of a scene, living in her admired sister's shadow... After witnessing the death of Obito, Lucy is sure to follow his same fate, only to be resucued by a man with long black hair and red battle armour... Years later, Lucy returns to the Leaf, with her ultimate goal to kill her rival, Kakashi Hatake after he abandoned her all those years ago, and too find Rin. But first she'll have to lie low, until she can make her move, as she meets Team 7 and finally comes face to face with the masked Jounin who left her to die...can she really go through with her goal? Does she really have a heart of steel?