It is Kyouya Sata's 17th birthday, and his girlfriend Erika Shinohara seems to have forgotten all about it. Even her best friend Ayumi Sanda acts unaware and asks Kyouya to help her study after school. In secret, Erika is setting up a surprise at his apartment while Ayumi keeps him busy. Then a mishap outside his home throws Erika into a panic, and Kyouya has to find a way to settle her down. This one-episode comedy OVA came packaged with the 12th manga volume and adapts a well-liked chapter that the TV series skipped.