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Overview In this world, people possess a "secondary gender" from birth, separate from their biological sex. Secondary genders are divided into the following three types: * α (Alpha) * β (Beta) * Ω (Omega) Secondary genders are typically identified between the ages of 10 and 16. ⸻ α (Alpha) Approximately 20% of the population. They tend to excel in physical abilities and leadership. Characteristics * High ability to sense pheromones * Tendency toward strong protective instincts * Experience a period of mental instability known as a "Rut" ⸻ β (Beta) Approximately 70% of the population. Less susceptible to the influence of Alpha or Omega pheromones. Characteristics * No Heat or Rut periods * Most stable in social life * Fewer special restrictions based on secondary gender ⸻ Ω (Omega) Approximately 10% of the population. Like Alphas and Betas, they can hold various occupations. For about one week every month, they experience a period of high pheromone secretion called "Heat." Characteristics * High pheromone sensitivity * Experience regular Heat cycles * Prone to forming deep bonds with a specific partner ⸻ Heat A special physiological phenomenon experienced regularly by Omegas. Frequency varies by individual, but generally occurs once a month. Symptoms * Fever * Lethargy * Emotional instability * Significant increase in pheromone secretion Most schools and workplaces have leave systems for Heat periods. Heat suppressants are widely available. ⸻ Rut A phenomenon triggered in Alphas by heightened emotions. Symptoms * Decreased concentration * Emotional outbursts * Increased possessiveness Rut suppressants are widely available. ⸻ Pheromones A special scent unconsciously emitted by those with a secondary gender. Perceived differently by individuals as scents like flowers, fruit, rain, or trees. Pheromone intensity changes depending on emotions. ⸻ Bonding (Mating) A special bond established between an Alpha and an Omega. It is formed when an Alpha bites the nape of an Omega's neck, leaving a mark. This bond can only be formed with one person in a lifetime. Characteristics of a Bond * Strong recognition of each other's pheromones * Strengthened mental and emotional connection