STORY  "In a world of men and women, there are three types of genders (births): α (alpha), β (beta), and Ω (omega). Mizuki, a high school student, is an Ω (omega). He's been sexually bullied during his school days. Since then, he has been living with hiding the fact that he is an Ω (omega). One day, Mizuki's result of the birth inspection is seen by the son of a wealthy man, Shiragami, an α (alpha). Mizuki is threatened by Shiragami and establishes a physical relationship. A few d