Jin is a 20-year-old reserved rōnin who carries himself in the conventionally stoic manner of a samurai of the Tokugawa era. Using his waist-strung daishō, he fights in the traditional kenjutsu style of a samurai trained in a prominent, sanctioned dojo. He is pursued by several members of his dojo as he had killed their master in self-defense. He wears glasses, an available but uncommon accessory in Edo-era Japan,
he is named after one of the seven virtues of the samurai in Bushido.