In Rurouni Kenshin, Saito Hajime is the one man Kenshin can never quite relax around: a cold, ruthless former Shinsengumi captain turned Meiji police officer, living by the creed Aku Soku Zan — "Slay Evil Instantly." He's so perfectly archetypal that many fans assume he's pure fiction.
He isn't. Saito Hajime was a real person — and his actual life followed the manga more closely than you'd expect.
The deadliest captain of the Shinsengumi
The real Saito Hajime joined the Shinsengumi — the shogunate's feared special police force in Kyoto — in 1863. He rose to become captain of the Third Unit and served as a swordsmanship instructor, one of the most dangerous blades in an organization full of them. While other famous members died young, Saito had a talent that would define his whole life: he survived.
He lived through the fall
When the shogunate collapsed and the Meiji Restoration swept the old order away, most of the Shinsengumi were killed or scattered. Saito kept fighting — through the Boshin War, alongside the Aizu domain that had backed the shogunate to the bitter end. Even on the losing side, he didn't lay down his sword.
This is the part Rurouni Kenshin gets right at its core: Saito is a man of the old world who simply refused to die with it.
A new name, a new life
After the war, Saito reinvented himself. The former Aizu lord, Matsudaira Katamori, granted him a new name: Fujita Goro. Under it, he married Tokio, the daughter of an Aizu retainer, in 1874 — and built an ordinary family life, the kind his younger self could never have imagined.
If "Fujita Goro" rings a bell, it should: that's the alias Saito uses as a police officer in Rurouni Kenshin. Watsuki took it straight from history.
The Meiji policeman
In July 1874, Saito — now Fujita — joined the Tokyo Metropolitan Police and worked in intelligence. Then, when the Satsuma Rebellion erupted in 1877, the old warrior went back to battle one more time.
Promoted to assistant police inspector, he served with the police drawn-sword squad — units of former samurai sent in with blades when guns alone wouldn't do. Charging into the fighting, he was wounded by enemy fire but pressed on, and is credited with helping capture two enemy cannons. The Shinsengumi spirit, it turned out, never really left him.
A quiet ending
The man who had survived the bloodiest years of the Bakumatsu, two wars, and the death of his entire world finally died peacefully in 1915, at the age of 72 — an almost unthinkable lifespan for a swordsman of his generation.
What the manga kept, and what it invented
Watsuki built Rurouni Kenshin's Saito on a remarkably solid historical foundation:
- Real: the Shinsengumi captaincy, surviving the revolution, the "Fujita Goro" police identity, serving the new Meiji government.
- Invented (or legendary): his signature thrust technique the Gatotsu, the catchphrase Aku Soku Zan, and much of the cold, theatrical persona. (Even the famous "left-handed thrust" associated with the real Saito leans more on legend than hard record.)
That mix is exactly why he works so well. Saito is one of the most grounded characters in the series precisely because his arc — a die-hard loyalist who outlives his cause and quietly serves the very order he once fought — actually happened.
The stubborn old wolf of Mibu didn't just survive the manga. He survived history.
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Sources: Saito Hajime who joined the Metropolitan Police — Rekishijin, Saito Hajime's life and sword — Intojapan Waraku, Saito Hajime — Japanese Wikipedia