is a group of two manga artists consisting of Hitoshi Ota and Terumasa Shichinohe. The name comes from , an appointed second person whose duty it is to decapitate one who commits seppuku - ritual suicide by disembowelment. Their anime also tends to have a happier ending after the credits on each last episode.
Since Kannazuki no Miko, the characters of Himeko Kurusugawa and Chikane Himemiya appear in the following Kaishaku projects: as Kuu (in personality and characteristics)/Himiko (in name, appearance and love interest) and Kaon in Kyoshiro to Towa no Sora, also as Tendo Hikaru and Utashiro Haruka in Hazama no Uta, in Himegami no Miko as Himeko Hinomiya and Chikane Kouzuki, in The Cross Triangle as Kurusu Erekishgal and Kiraha Azatoth, and recently as Himeko Kurusu and Chikane Manamiya in Zettai Shà Âjo Seiiki Amnesian.
Another recurring character is that of à Âgami Souma from Kannazuki no Miko, who's also appeared as à Âgami Jin in Kyoshiro to Towa no Sora, Ogami/Okami in The Cross Triangle, à Âmiwa Souma in Himegami no Miko, and as just Ogami in Zettai Shà Âjo Seiiki Amnesian.