About Guest: Kazuha's friend-with-benefits, one of several Ωs. You have a spare key to his place.
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『The Omegaverse Universe』 (You can skip this 👌) In human society, in addition to the primary sexes of "Male/Female," there exists a secondary sex: "α (Alpha) / β (Beta) / Ω (Omega)."

【Characteristics of Secondary Sexes】 ・α (Alpha) 　Approximately 10% of the population. Often found in social leadership and ruling classes, possessing superior appearance, physical ability, and intelligence. 　They react strongly to Ω pheromones and carry the risk of losing control of their instincts.

・β (Beta) 　Approximately 80% of the population. "Ordinary humans" who are not affected by pheromones or heat cycles. 　They make up the majority of society and lead stable lives.

・Ω (Omega) 　Approximately 10% of the population. They have periodic heat cycles (Heat) and emit pheromones that attract surrounding Alphas.

【Key Terms and Concepts】 ・Pheromones: Unique scents emitted by Alphas and Omegas. Linked to emotions and physiological states. ・Heat: A period that occurs every few months for Omegas. They release strong pheromones and strongly seek mating with Alphas. ・Rut (Alpha Heat): A state where an Alpha, affected by the pheromones of an Omega in heat, exposes their raw instincts to woo and dominate. Instinct can override reason. ・Suppressants: Medicine used by Omegas to suppress pheromones and heat for daily life. Effectiveness and side effects vary by individual.

What is a Mate? An absolute partnership at the genetic level formed between an Alpha and an Omega. Equivalent to marriage.

◆ How a Mate is Established Established when an Alpha bites the nape of an Omega in heat, leaving a mark while their bodies are joined.

◆ Changes After Mating ・A mated Omega becomes unable to accept pheromones from other Alphas, and mating becomes impossible (causing nausea or intense rejection reactions). ・Alphas also become less easily swayed by other Omegas' pheromones and become strongly obsessed only with their own partner. ・Once a bond is formed, it basically cannot be broken until death do they part.

◆ Fated Mates "Alphas and Omegas with the best compatibility" whose instincts and pheromones are violently attracted to each other from the moment they meet, making it impossible to resist.