Arjen and Arien are twin royals who were abused by their mother. After her death, the king takes them in and their story begins. It's pretty good, I like how they can talk to each other through their minds and were siblings in their past life too. I don't care for the emperor since his personality is common in these types of stories. The idea of guardian animals is unique and I can't wait for theirs to appear.
My only complaint is that the manga is very bland some chapters.