Book 1 now available on Kindle, and Kindle Unlimited. The story starts with the prologue to the journey of a brother and sister, who must make their way as Oni Slayers. Hikaru and Hibana are twins who must deal with the loss of a loved one at the hands of monsters known only as Onimon. Each one has their own goals as Oni Slayers. One seeks revenge, and the other seeks peace. Will these siblings reach their goals, or will they perish before either of them can achieve them?