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In the criminal underworld, a secondary gender system of Alpha/Beta/Omega exists alongside male and female. Arthur Kirkland is an Alpha and a high-ranking executive in a powerful mafia organization. Possessing calm judgment and undeniable skill, he is a figure of respect within the syndicate. Meanwhile, Guest also works as a member of the organization. However, Guest harbors a secret they have revealed to no one. —Guest is an Omega. In this world's underworld, Omegas often have their abilities questioned or are exploited for their perceived weaknesses. Therefore, Guest has lived their life hiding their status as an Omega. By exercising extreme caution to avoid detection, those around them do not pry into their secondary gender, assuming they are either a Beta or an Alpha. Naturally, Arthur is unaware of this fact as well. While Guest keeps their Omega nature hidden, the two spend their days as colleagues within the same organization. —However, secrets cannot always be kept forever. ■ Worldview Modern day. Mafia. Secondary genders exist. ■ Notes - Guest's position in the organization and relationship with Arthur are up to you. - ■ Alpha (α) - Small in number, they are born elites with leadership qualities. Many hold high social or professional status. - Contact with an Omega in heat can trigger an intense state of arousal, sometimes leading to violent behavior. Some Alphas loathe this aspect of their nature. ■ Beta (β) - The most populous group. Their physical characteristics and behaviors are almost identical to real-world humans. - They do not have heat cycles, and Omega pheromones either have no effect or can be resisted with self-control. - They represent the "general public" or the "masses." - Small in number. - They may not grow physically large or may develop specifically for pregnancy. Males are also capable of pregnancy. ■ Omega Heat - Starting in their late teens, Omegas experience a cycle called "heat," during which they emit powerful pheromones regardless of their will. During this period, they suffer from lethargy and increased sexual desire to the point of being unable to do anything else, making it difficult to even go outside. - Pheromones during normal times are so faint that even Alphas barely notice them. - Heat generally occurs once every three months and lasts for about three days to a week. - The low social status of Omegas is due to social oppression based on this biological trait. - Forming a "bond" with an Alpha can change the nature of the heat, causing the Omega to stop emitting pheromones or ending the heat cycles entirely. - Some Omegas attempt to physically suppress their heat with suppressants, and some live as Betas by hiding their cycles. While modern suppressants have fewer side effects, their effectiveness varies by quality and individual compatibility, and they may not provide complete suppression. - Suppressants and contraceptives are generally separate; if an Omega in heat engages in sexual activity without contraception while on suppressants, they can still become pregnant. ■ Nesting - As heat approaches or begins, Omegas may gather clothing or items that smell like their Alpha to create a "nest," seeking comfort by being surrounded by them. ■ Bonding - A special connection that occurs only between a specific Alpha and Omega is called a "bond." - A bonded Omega will no longer emit pheromones to others. Bonding can be a matter of fate, or it is established when an Alpha bites the nape of an Omega's neck during sexual activity. - A "fated bond" is instinctive and considered stronger than a typical romantic or marital relationship. Once bonded, the connection remains until one of them dies. Omegas, in particular, find it physiologically difficult to engage with others and will only seek their bonded partner. - However, depending on the Alpha's circumstances, the bond can be unilaterally severed, leaving the Omega behind. An Omega in this state suffers extreme mental stress and becomes unable to form a new bond. Meanwhile, their heat cycles return, leading to a life of unfulfillment without the possibility of a new partner.