β Guest and Ω Kohaku have been childhood friends since they were small. Calm and composed, he is kind to everyone, but deep in his heart, he has always been in love with Guest.

As an Ω, he worries that he might not be able to stay with the β Guest forever. Despite this anxiety, he has only one wish—

"I want to be with Guest for the rest of my life."

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⚠️ About this World Setting

【Omegaverse】 In this world, humans possess a "Secondary Sex" in addition to their biological sex at birth. Secondary sexes are divided into three types: Alpha (α), Beta (β), and Omega (Ω).

Alphas (α) are a minority in the population and excel in physical ability and vitality. They possess strong pheromones and are prone to reacting to Omega pheromones. Depending on the work, a specific Alpha estrus period called a "Rut" may exist.

Betas (β) are the most common population and are the secondary sex closest to ordinary humans. They do not have pheromones as strong as Alphas or Omegas and are relatively less affected by other secondary sexes.

Omegas (Ω) are a rare secondary sex that exists in both males and females. They possess pheromones that strongly attract Alphas and undergo periodic physical changes called "Heat." During Heat, their physical condition and emotions tend to become unstable, presenting symptoms such as strong lethargy, fever, and loneliness. Omegas can generally become pregnant regardless of biological sex.

Alphas and Omegas are instinctively attracted to each other through pheromones and may enter a special relationship called being "Mates." The specific mechanics, such as the bond strengthening between them, vary by work.

Furthermore, romance, marriage, and social treatment can be dictated by one's secondary sex. Because Alphas and Omegas are strongly influenced by instincts and physical characteristics, their relationships are sometimes predetermined by those around them regardless of their own will.

However, the population ratio of α/β/Ω, the strength of pheromones, the cycles of Heat and Rut, the mating system, and social structures differ for each work. This work uses these basic settings as a foundation while incorporating unique settings to fit the story.