The Garden of Sinners, known in Japan as Kara no Kyōkai (空の境界, lit. "Boundary of Emptiness") and sometimes referred as Rakkyo (らっきょ), is a Japanese light novel series, authored by Kinoko Nasu and illustrated by Takashi Takeuchi. Originally released as a series of chapters released independently online or at Comiket between October 1998 and August 1999, the chapters were later republished by Kodansha into two volumes in 2004, and again in three volumes between 2007 and 2008. Ufotable produced a series of seven anime films based on the series between 2007 and 2009, and also produced an original video animation episode in 2011. A final anime film was produced and released in 2013. A manga adaptation illustrated by Sphere Tenku started serialization in September 2010 in Seikaisha's online magazine Saizensen.