Anti-prom

The anti-prom is an annual event at Daten City High, in which the geeks get together on the day of prom and record the lesbian students having sex. It is briefly mentioned in the Manga Strip chapter, "Hole Guys: We're the Dancing Hole Brothers", when Brief revealed that Stocking crashed prom the previous year and had sex with other lesbians. The geeks taped the sex and used it to pleasure themselves numerous times.