How does Vagabond differ from Yoshikawa's Musashi novel?
Same road, different traveler. Inoue keeps the novel's itinerary and reinvents its people.
Inoue has never hidden the method: Vagabond follows Yoshikawa's map and redraws its humanity. The duels stand where the novel put them, but the man fighting them is younger, crueler, and more frightened than Yoshikawa's hero, and the rival waiting at the end of the road is a different person altogether.
The differences below are the documented ones, several of them in Inoue's own words. They are also the reason the manga survives comparison with a national classic: it is not an illustrated edition of the novel. It is an argument with it.
THE BIG DEPARTURES
Where Inoue leaves YoshikawaThe seventy Yoshioka
The manga's most famous set piece, Musashi alone against the entire Yoshioka school, is Inoue's invention. He has said he built it because Musashi needed a greater challenge than the novel gives him, and it costs the character a leg wound that shadows the rest of the manga.
A deaf Kojiro
Yoshikawa's Sasaki Kojiro is a proud, talkative dandy of the sword. Inoue's is deaf, raised in silence by the swordsman Kanemaki Jisai, and the manga gives him a six-volume arc of his own, a co-protagonist the novel never attempts.
Characters reimagined
Inoue has stated plainly that he changed the supporting cast's personalities from the novel to suit his telling: Matahachi weaker and more pitiable, Otsu redrawn, Takuan turned stranger and funnier.
A ronin, not a samurai
Against the popular image, Inoue's Musashi does not walk a bushido path. The author regards him as a ronin feeling toward his own code, which is why the manga's late chapters trade duels for farming and questions.
The structure of a life
William Scott Wilson, Musashi's English biographer, judged the manga darker and more mature than the novel, and no substitute for it. The Los Angeles Times praised the same trade: deeper characterization, a different Kojiro, a harder road.
What stays the same
The itinerary. Sekigahara, Miyamoto village, Kyoto and the Yoshioka, the Hozoin spears, the Yagyu, Baiken's chain and sickle, and the gathering shadow of Ganryu Island: the stations are Yoshikawa's, the weather at each is Inoue's.