The fifth volume of the Tasogare Otome × Amnesia manga series covers Chapters 19 to 24, which covers Seikyou Academy's school festival and the investigation of one of the Seven Mysteries. It also includes the special chapter of the series for Square Enix's newest magazine, BIG GANGAN.
The day also marks the start of Seikyou Academy's school festival. Yuuko and Teiichi pass time doing fun things together.
However, one of the Seven Mysteries, the story of "Akahito-san" approaches...