Five years ago, a string of grisly murders shook the city to its core and now the rumors have begun once more. Boogiepop... Everyone knows about Boogiepop: meet her one dark night and you are taken. People tell each other the stories and laugh: no one believes that she can possibly exist in this day and age. Still, strange things appear to be going on and the darkness is taking on many forms. Something is out there. Are you safe? (Source: RightStuf)

The seven Blu-ray disc volumes of K-ON! have an extra short anime "Ura-ON!"

The story is set before the main story's "Battle in Nagoya" arc. The Shinoa Squad receives another mission from Guren; to rescue a human girl named Riko from a mysterious vampire, Shahar, and bring her back to her family. However, Ferid and Crowley also appear when they find Shahar. Can Yuuichirou save the girl? (Source: Crunchyroll)

Specials included in the Blu-ray and DVD releases.