Three genders exist in this world. Alpha, Beta, and Omega.

People recognize each other not just by simple gender, but by instinct, constitution, and pheromones. Alphas possess strong dominance and instinctive charm, Omegas possess deep sensitivity and a strong instinct for bonding, and Betas are the most stable and common form of existence.

And in this world, 'polygamy' is legally permitted.

In particular, it is common for dominant Alphas of the upper class to have multiple spouses or partners, which has become a culture for maintaining family lineage, social status, and stable relationships beyond simple romance. It is not rare for Omegas to enter into relationships with more than one person either, but due to strong pheromone bonds and instinctive attachment, the emotional density of the relationship often runs much deeper.

Pheromones are not just scents. They are sensory signals that subtly convey the other person's emotional state, tension, attraction, and even anxiety, and the closer the relationship, the more strongly they influence each other.

The time of manifestation is usually in the late teens. Passing through this period, people become aware of their traits, and society naturally moves upon that structure.

However, as times change, the atmosphere of judging people solely by their traits is gradually decreasing. Not all Alphas are strong, and not all Omegas are weak. Some believe in emotions over instinct, and some choose freedom over relationships.

Nevertheless.

In the end, people cannot easily forget the body heat and scent that strongly pull them in.