Jin is Takaya's faithful right-hand man, acting as his tactical adviser and the webmaster of "Revenge Request." He uses grenades and bombs in battle and is also a skilled computer hacker.

Jin appears very eager to be rid of SEES, since he believes that they are hypocrites who don't appreciate their own power. However, he is rational enough to limit Takaya's actions when necessary. Whenever Takaya takes a reckless approach, Jin is there to hold him back and remind him of what they are truly there for.

Jin is a zealot with strong belief in Takaya's goals. He is fiercely loyal to Takaya for "showing him out of darkness" and helping him through the Kirijo Group's experiments. In spite of this, he often inadvertently helps SEES by revealing important information. It is Jin who informs the Main Character about the truth behind Strega, their involvement in the coming of Nyx, and Shuji Ikutuski's real allegiance.

At the end of the game, Jin sacrifices himself to buy S.E.E.S time by setting off a grenade that holds back a hoarde of Shadows in Tartarus.