Reborn as a Demon Tiger: Rising to Power by Saving My Little Sister

[No female lead] [Absolutely no saintly behavior: decisive and ruthless, and ready to fight anyone who challenges him] [Fast power-ups, total domination, deeply satisfying stress relief] The world mutates. Magical beasts descend upon Earth, spiritual qi revival begins, and the entire planet enters an era of high martial arts. Humanity becomes food kept in captivity by the Demon Gods. Zhang Xiaohu is reborn as a demonic tiger. Starting with saving his younger sister, he rises to power and goes on to save all of humanity.