Kouga Ninpouchou (甲賀忍法帖)

"甲賀忍法帖" is a song by the Japanese heavy metal band Onmyo-za and the first opening theme for the 2005 TV anime Basilisk (バジリスク 甲賀忍法帖), which was animated by Gonzo. Its title refers to Futaro Yamada's novel Kōga Ninpōchō, the source material that also inspired the series.

Onmyo-za released the song as a single in 2005, and it later appeared on the band's 2006 studio album "臥龍點睛" (Garyoutensei). On the single, Matatabi (瞬火) wrote the lyrics and Maneki (招鬼) composed the music.