Sentai Filmworks has announced that its home video release for No. 6 is going out of print. Anime News Network is reporting that Sentai Filmworks’ license for the property license has expired.
Sentai Filmworks licensed the anime in 2011 and released it on Blu-ray Disc and DVD in 2012.
The anime adaption of Atsuko Asano’s novels aired in 2011, and Crunchyroll simulcast the series as it aired. The series is still available for streaming on Crunchyroll from publisher Aniplex of America.