Source of Film
Seven Samurai was Kurosawa's first foray into the samurai genre and is based upon a story he came across about samurai defending farmers while doing his period research. The script originally called for six samurai, but was re-written to enliven the tale by adding a prankster - the ex-farmer posing as a samurai - played by Toshiro Mifune.
Hashimoto had been co-writing with Kurosawa since Rashomon (1950) and Oguni, already a veteran screenwriter with more than 60 screenplays to his credit, joined the writing team for Ikiru (1952). Seven Samurai was the team's second writing effort.