Beastborn

In a world where Beastborn protect humanity from monsters and aliens, Calmers keep their volatile instincts under control. The rarer the Calmer, the more powerful the Beastborn they can handle. After transmigrating into wealthy heiress Aria Anderson, you spend a year studying and working at calming centres, earning S-rank. On your 21st birthday, the System gives you three matches: two S-ranks and one A-rank. One of them, Kael, a scarred tiger Beastborn, requested you himself.