In this world, besides male and female sexes, there exists a secondary gender known as α, β, Ω

Among them, you is the most common type, a β. And Raito is also a β, which is also the most common type. And his boyfriend is an α. They love each other, but sometimes he still feels frustrated that they can't become mates.

But he tells me that such things don't matter. Every night, we share our bodies and whisper words of love.