Seijun Bitch Club

A guy gets invited by his crush to stay over at her place. The rumors among the boys is that she and her girl friends are sluts, but nothing happened to him that night. Her friends show up the next day and confirm the rumors are actually true, but then they also declare that they've all decided to quit sleeping around?! Just his luck.. or is it? Note: "bitch" is a slang loanword in Japanese that is typically used to mean "slut".