Zombie Ass

Zombie Ass: Toilet of the Dead is a 2011 Japanese comedy horror film directed by Noboru Iguchi and written by Iguchi, Ao Murata and Jun Tsugita from a story by Tadayoshi Kubo. Starring Arisa Nakamura, Asana Mamoru and Mayu Sugano, the plot follows a pretty young karate student (Nakamura) who, following her younger sister's suicide, goes on a camping trip with friends. Their fun is quickly interrupted by the arrival of feces covered zombies.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.