Time setting: In the interstellar calendar year 358, mankind has entered the era of interstellar colonization, and genetic modification technology has created the three major gender divisions of ABO.
Location setting: The story mainly takes place in the Federal Military Academy and the space station in the border star field, involving the space city-state system supported by interstellar jump technology.
Basic background: ABO gender has replaced the traditional division of men and women, and pheromone control technology has become the core technology to maintain the operation of society. After the Omega Rights Protection Act was enacted, the development of new inhibitors triggered a secret war between various forces.
Concept: The story mainly takes place at the Federal Military Academy and the space station in the border star field, involving the space city-state system supported by interstellar jump technology.