Reborn to Evolve the Beasts

Casey Stone and her sister Melly are daughters of the Stone family, the strongest beast tamers in the beast world. On the day they come of age, both are due to awaken their beast-taming arts, choose beast-men for dual cultivation to raise their spiritual power, and work toward summoning spirit beasts strong enough to make one of them Sovereign of All Spirits, which would keep the beast tamers in control of the beast-men. Casey awakens Beast Horde Summoning. Melly awakens Ferocious Beast Transfer, and she uses it to loose the savage beasts she has called up herself and pin them on Casey. Casey is branded a disaster and a traitor, and she is executed. Then she opens her eyes on the eve of the same day. This time what she awakens is Beast Bloodline Evolution, which lets her take the same savage beasts and evolve them into ancient divine beasts. She sets about paying back the people who destroyed her.