仁義なき戦い
Kasahara used the 1936 film "La belle équipe" as a guide for the action in "Battles Without Honor and Humanity". The writer had concerns over organizing the real facts to make stories, as one could not fit everything into an action movie, and how close to stick to reality, settling on a mix of reality and human drama. He deleted all the scenes with Hirono (Minō) interacting with a female heroine, as it was the only request of Minō, who Kasahara felt had given his unspoken approval by now. This is the reason the film ends abruptly. The screenplay took Kasahara 69 days to write.