Thousands of years ago beasts and humans came together to start breeding a new kind of race. They are called the Hybrid race.Those who are born from beast to man and only show signs of turning into animals and humans are called hybrids. Those who are born from beast to man and have the powers from the beast but can't turn into animals are called beast tamers. And those who are born from beast to beast are what they call pets.

Keiko Hastu is a 16 year old high school girl orphan who goes to Bt academy beast tamer academy. And her dream is to be the world's best Beast tamer and that means overthrowing the original.

Keiko has to face a lot of hardship and go through many challenges along with never ending training to get to the top. But she won't be doing it alone with her trusty partner by her side. She believes they can take over the world.