VRPN-012 Karen Sakisaka, Mayoi Sakuraya - Strong-Urine Academy

In a near-future where male herbivorization has progressed and population decline is unchecked, the government has obligated women to collect every last drop of male sperm to combat the low birthrate. A certain academy distributes "sperm collection notebooks" to its female students and implements strict school rules where evaluation is determined by the amount of sperm collected. Young women's urine has the effect of dramatically increasing sperm count, so female students force male students to drink their urine multiple times a day to coercively collect sperm.