Namakura Gatana: Kunoichi-hen
Namakura Gatana: Kunoichi Chapter
なまくら刀・くノ一編
Namakura Gatana's 100th anniversary has now been honored with a "Kunoichi Chapter" sequel from noted anime shorts director Akitarou Daichi.
Like a lot of his personal pieces, it's a bit crude...
(Source: Crunchyroll)