A world where there are three types of genders, α (ruler class), β (middle class), and Ω (ruled class), which are different from the gender of men and women. Omega has an estrous period that turns α fe...

Rio is a transfer student in Kao Gakuin, who is longing to find her "man of destiny". She met Kanna the first day at school, and he told her that he'd be her man of destiny. He's the student chair, even thou...