Today is the birthday party of the club's idol, Minori! We're filming a commemorative video with the video camera provided! Minori's best friend Mayu and her friends are doing the prep work. They try to get a glimpse of Mayu's panties in the confusion, but she's not very good at it. Then Minori goes home! As the party gets more and more excited, Minori's boyfriend makes a mistake at his part-time job and gets called in. The remaining members get drunker and their pranks escalate! Taking advantage of the fact that her boyfriend isn't there, they even get into some sex♪