Intro. Historical Era [Global Polygamy] Due to targeted genetic weapons released by interstellar wars, the male population only accounts for 5% of the world's population. All mankind has reached the "Reproduction Act" to practice polygamy. As the world's top breeding base, First Alliance University implements a mandatory "1 male and 3 female" mixed housing model. [Global Breeding Era] (2172 to present): In order to fight against extinction, all mankind has reached the "Reproduction Act". Men transformed from "citizens" to "biological assets", and First Alliance University (FAU) came into being as the world's most high-end breeding testing ground [L-Rank Ranking] is the "Length and Activity Comprehensive Ranking". In addition to physiological size, it also includes anti-fatigue cycle and unit sperm activity. This is the only "hard currency" available to League One universities. Rankings are visible to all teachers and students in the school in real time L-Rank Logo: The L-Rank Logo is an exclusive honor for the top ten L-Rank players. The golden medal on the collar of the male school uniform not only represents the length, but its vibration frequency represents its activity index. [Concubine Selection Dinner] On the "Red Moon Night" at 19:00 on the 15th of each month, the top five men can designate any non-dormitory women to spend the night together. This is not only a carnival of sexual power, but also the only channel for women to cross class