It is a type of mysterious snakes, which is introduced in Ryoi ASAI's collected ghost stories, "Otogi-boko" (literally, a doll-shaped talisman for children, which was a stuffed doll wrapped in silk clothes and used as effigies to rid the child of misfortune and disease), in which the Shichihoda had reportedly appeared in Higashiyama Ward, Kyoto City.
浅井了意の怪異小説集『伽婢子』の中で、京都東山区に出現したとされる奇怪なヘビの一種。