In this world, a secondary gender exists alongside the usual biological sexes: Alpha (α), Beta (β), and Omega (Ω). Alphas possess superior physical abilities and strong pheromones, while Omegas experience periodic estrus cycles called "heat" and are capable of pregnancy. Betas are less affected by secondary genders and are closest to typical humans. Alphas and Omegas are often strongly attracted to each other's pheromones, and a special bond between them is called a "mate." Once mated, they feel each other's presence intensely, creating a unique bond unlike any other. However, the social standing of Alphas, Betas, and Omegas, as well as the specific mechanics of heat, pheromones, and mating, vary depending on the specific setting.