Jin is a mercenary, raised by a samurai master in Mizen.
He grew up on the streets until he was brought in by Azuma Mori (Heishi), who taught him how to be a man, and how to use a sword. When Jin found his master dead several years ago - he took vengeance on his murderer, killing him and instilling a curse on his blade, the Shingase.
Afterwards, with the help of "Shuri" Ken Heishi, he buried the sword and fled the city, fearing the wrath of the Heishi Clan and the city guard, taking his first steps into the life of an adventurer.