Kaishaku(介錯) is a group of two mangaka consisting of Hitoshi Ota(太田 仁Ōta Hitoshi) and Terumasa Shichinohe(七戸 輝正Shichinohe Terumasa). The name comes from Kaishakunin(介錯人), an appointed second person whose duty 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.