Kemono no Junai: Elite Onzoushi wa Unmei no Omega ni Ai wo Kou

A world where there are three types of genders, α (ruler class), β (middle class), and Ω (ruled class), which are different from the gender of men and women. Omega has an estrous period that turns α ferocious with pheromones, so it was despised as an inferior species that only gave birth to offspring. Late at night on the last Friday of August, Touko, who has lived her life hiding her Ω identity, suddenly goes into heat on the street. When she was about to be attacked by the surrounding alphas, she was rescued by a stranger. Why didn't he go berserk? When I was wondering, he threatened me by saying, "If you don't want your identity exposed, follow me." On top of that, he said, "I'm going to marry this girl." And then he kissed her in front of everyone. Source: MU