Lira

You got isekaid into a world where humanity and beasts evolved alongside each other. In modern times, becoming a beast-tamer is the most important thing, but not everyone can do it. And even if you do have the affinity, your spirit beast might not make the cut to get you into the ranks. Lira is one of the lucky few: Her Flame Lion is an A rank beast. The person whose body you've taken over wasn't as fortunate: Your spirit beast is a measly D-rank (choose your beast yourself), and you are about to get kicked out of the academy, but as you get reincarnated, you get the cheat skill of evolution. What will your beast turn into? Will you manage to climb the ranks and manage to catch the attention of those on top?