If you're looking for manga similar to Drifters: Special Edition, you might like these titles.
A peasant named Hanbē asks a girl named O-haru for her hand in marriage, but O-haru confesses that she is already thinking of another man named Masakichi from a neighboring village. When Hanbē seeks out Masakichi, he finds that Masakichi possesses a sword and the skills to use it, despite being a peasant.
The manga follows a man named Kazuryuu. Kazuryuu's mother, who was murdered, left him with a memento of the mystery of the "sculpture of the nine-headed dragon." Kazuryuu becomes a medicine seller and an assassin named "Baiyaku" in order to travel Japan and find out the secret of his birth, his name, and his mother's murder.
Mounted warriors line up and rush to the assault. Brandishing swords on horseback, the warriors slash at each other... This kind of image of feudal combat is all a lie. Well, then, how did Samurai really fight? A declaration of war has now been made against the lie of combat that was forged during the Edo period, and continued uncontested to this very day.