A co-production between Japan and Indonesia, the screenplay was written by Takuji Ushiyama and The Mo Brothers' Timo Tjahjanto with Kazuki Kitamura and Oka Antara in the starring roles.

[2] Nomura Shuhei (Kazuki Kitamura) is a young Japanese executive in Tokyo who is charismatic and well-liked but has a darker side.

[3] Tjahjanto mentioned in an interview that the idea for the film came from Ushiyama who, upon viewing the duo's breakout hit Macabre, proposed a slasher story involving two masked killers competing to kill people on the internet.

[5] Killers premiered in the Park City Midnight section of the 2014 Sundance Film Festival in January 20 as an official selection.

[11] In a positive review, Martin Tsai of the Los Angeles Times wrote, "This seemingly generic thriller has plenty of twists in store, but perhaps none as surprising and impressive as its ability to manipulate the viewer–first to side with the villains, then to question one's own core beliefs.

"[12] Conversely, Simon Abrams of The Village Voice called the film an "amateurishly realized sensationalism", criticizing Nomura's and Bayu's characters as "generically morbid sociopaths with way too much time, and blood, on their hands".