The exact origin of Ananku is unknown, but it is believed that Chotoku Kyan (1870-1945) either learned the kata from a Taiwanese who visited Okinawa,or brought it back with him following a journey to Taiwan. The kata was developed as part of the Tomari-Te system during the early 1900's and was further passed on by Shoshin Nagamine and the Matsubayashi Ryu style.
The kata emphasizes both offensive and defensive moves from a deep zenkutsu dachi (front leg bent stance). Strong punches and double-punches occur throughout the kata.