Kazumi, Demon Spirit. The Ever Hero Saga, #5

Kazumi Hime was born to slay demons, until the fateful day she became one. Kazumi is a teenaged ninja warrior eager to prove she is ready to ascend to the vaulted rank of Night Blade; an elite group of female demon slayers. Denied by her mother, the High Priestess of the Yoru Ya-iba clan to complete her training, Kazumi sets off on her own to prove her mother wrong. But chance and fate have other plans for young Kazumi when she is attacked by a monstrous chaos beast in the forest and left for dead, or so she thinks.
Soon after, Kazumi realizes the horrible truth: she has become the one thing she has spent her life training to kill. Outcast from her home, wandering the countryside, Kazumi meets a stranger named Sunny, who joins the young ninja warrior in her quest to find an antidote. Sunny promises Kazumi answers to her unique condition but carries a dark secret of her own. Whether Sunny is friend or foe, only time will decide. "Crouching Tiger, Hidden Demon!" An anime and manga inspired action romp.