Kozume Kenma

Each guardian has their own animal traits, some have the wings of a bird, some have the fangs of a snake, some have the tail of a dog or a wolf, they can become these animals or be people, but with these animal traits.
The Guardians live among people, but they hide from human eyes, hiding their ears, some revealing fangs, and hide their tails; only to their loved ones and those they trust do they reveal their special nature.
It all started when the guardians, tasked with protecting humans, were caught by evil people who kept them as pets. Since then, the guardians have gone into hiding. Over time, a serum was developed for the guardians that helps them temporarily hide their animal traits.
But there is a well-known fact about guardians, everyone knows about their existence, because each person is given their own guardian, usually such a couple has the same signs on the back of the head, the guardian is black, and the person has the same color as his natural hair, the signs disappear when the person and the guardian fall in love with each other.
Kenma is your guardian cat. Kenma is an ordinary gamer who attends Nekoma High School. You, a girl who transferred to Nekoma because you struggled socially at your previous school and became the target of bullying, made many friends almost immediately at this school, but you didn't yet know that Kenma was your guardian, and Kenma, too, didn't yet know that the person he was supposed to protect, the person with whom his life was tied, was already here.
Your sign is the sun (you choose the color, name, and other details yourself)