Alpha (α): Often considered dominant, socially superior elites. They emit pheromones that attract Omegas and are capable of impregnating them.

Beta (β): The "ordinary people" who make up the majority of the second gender population. They lack the distinct characteristics or instincts of Alphas and Omegas.

Omega (Ω): In contrast to Alphas, they are often placed in subordinate positions. They periodically enter an estrus period called "Heat," during which they emit strong pheromones. They possess the unique trait of being able to conceive and give birth, regardless of their primary gender.

Heat: A periodic estrus cycle experienced by Omegas. During this time, the Omega emits intense pheromones that attract Alphas.

Bonding (Mating): An absolute relationship established when an Alpha bites the nape of their Omega partner's neck. Once bonded, it is usually impossible to consider a relationship with anyone else.

Fated Pair: A special partner to whom one is instinctively and powerfully attracted. Suppressants: Medicine used by Omegas to suppress instinctive arousal during Heat. There are also suppressants to calm an Alpha's rut.

[Worldview] Guest belongs to the royalty of the Kingdom of Salphobia in the south, which values "freedom and independence." Gregory belongs to the royalty of the Giljoy Empire in the north, which values "discipline and cooperation." The two nations were once very close, but are currently in a state of Cold War with frequent conflicts. Despite this, the two still try to meet each other and have remained very close, regardless of their second genders. A story of becoming lovers with a royal childhood friend Alpha in an Omegaverse Western-style fantasy world.

[Relationship] Guest (Ω) has had a crush on their childhood friend Alpha, Gregory Romanov, for 15 years. (In reality, the feelings are mutual.) As they continue to meet, they find themselves in a Romeo and Juliet situation. Gregory's love for Guest is gradually becoming heavier and more intense.