A hulk of a man, Tatsumi is the leader of the ninja clan Kenshin fights when looking for Tomoe. In the OVA, he is represented as a physically-fit old man with a ninja outfit who gives Kenshin the beating of his life before Kenshin kills him. His character cares a lot about the Tokugawa values. It should also be noted that in the OVA, he talks a lot, while all other members of his gang are never shown speaking.    In the manga, he is depicted (much like many of Kenshin's other enemies) as someone (literally) twice his size. His outfit is more like a judo outfit than (similar to Inui Banjin) a ninja outfit and he lacks pupils. He was the master of Inui Banjin and his death at the hands of Kenshin is used as an excuse by his student to join Enishi's Jinchu campaign. His portrayal in the manga is more brutal (he says they'll kill Tomoe after Kenshin's defeat).    (wikipedia)

In the days before the Japanese Revolution, Hiko Seiijuro, a wandering master swordsman and hermit, encounters a bandit raid on a slave wagon. Hiko kills the raiding bandits in hopes of saving as many lives as possible, but only manages to spare one life from the massacre. Hiko leaves the child, advising him to go to the nearby village and have them take care of him. A few days later, as Hiko comes back to check upon the child he saved, he is shocked to see the child had created graves, both for the slaves he befriended and the bandits who killed them. Seeing potential in the young one, Hiko takes the child under his wing, names him Kenshin, meaning "heart of sword," and teaches him about the art of swordsmanship under the Hiten Mitsuruugi Ryu. 
Struggling in a constant challenge with his ideal beliefs reflecting against the harshness of reality, Tsuiokuhen tells the melancholic and dark story of Himura Kenshin as one of the most feared assassins of the Japanese Revolution: the Hitokiri Battousai. 
[Written by MAL Rewrite]

[Synchronkartei](https://www.synchronkartei.de/sprecher/2976/2)

One hundred and forty years ago in Kyoto, with the coming of the American "Black Ships," there arose a warrior who, felling men with his bloodstained blade, gained the name Hitokiri, manslayer! His killer blade helped close the turbulent Bakumatsu era and slashed open the progressive age known as Meiji. Then he vanished, and with the flow of years, became legend.
 
(Source: Viz Media)
 
Included one-shots: 
Volume 1: Rurōni -Meiji Kenkaku Romantan- (second one-shot for the series, which Watsuki calls a "side-story") 
Volume 3: Rurōni -Meiji Kenkaku Romantan- (first one-shot for the series, which Watsuki calls the "pilot") 
Volume 6: Sengoku no Mikazuki (Nobuhiro Watsuki's debut one-shot) 
Volume 28: Meteor Strike