Legend of Sword and Fairy: The Magic Mirror

The story

There are many monsters in the world. Regardless their level, they are all locked in the magic mirror of demons. The only way to escape is to kill others and only the ones with most kills can get out. The cat demon Tanshuang, the painting demon Dai Yan, and the tree demon Qing Huai are all caught in the mirror. They become friends aiming to escape together.