Ryo happened upon him when he was about to assassinate a master, and interfered. Jin was delighted to meet the youngster, inquiring with bright curiosity what his name was and amused by Ryo's righteous indignation at how he was using his skills. But Jin's target escaped, so our assassin threw his coin and scratched Ryo's face, and took off after the other man. He had no access to Ki-power. Jin was an ordinary human being (or as ordinary as you can get with skills like he had developed). Though Doushi Kaku warned Ryo off it, saying he would be defeated if he challenged such a master, our young hero fixated on Jin and, it would be accurate to say, stalked him. And as stalkers sometimes succeed in doing, he destroyed Jin's life.

However accurate that statement is, one has to know what Jin's life was like. Many years ago he had been the student of the greatest Kempo master anyone knew of. He was also in love with that man's daughter, Aki, a high school senior who was as much the opposite of her cold-hearted father as could be. Jin was a dedicated student, but one day when they were sparring on a cliffside above the ocean, his foot slipped and he fell. His teacher barely caught his left hand, but there was not enough leverage to pull him up, so the teacher shouted at him to let go. But the drop into the ocean was terrifying, and he could not. So his teacher pulled out a very large knife and cut off his arm.

To Jin that was the day he died. He got a prosthesis, mastered his arts, went on a campaign to slaughter in fair challenge other masters who considered themselves fit to destroy promising students and fully intended, when he was ready, to return and kill his first teacher. But the man foiled that plan by dying before Jin got around to it. Aki, who had become a nurse, suspected what he was doing, and met him at her father's gravestone to beg him to stop. She stirred up emotions he had forgotten but also brought sharp and clear the memory of how he had lost his hand. He warned her off him, but she loved him too much to let it go.

He encountered Ryo again, right after assassinating a master, and thoroughly enjoyed the boy's challenge. Damnit! Jin was meant to be a teacher! He should have been! He didn't even bother to really hurt Ryo, letting the boy try himself. But then, in frustration, Ryo called out his Ki power and blasted Jin. This sudden will to use a power your enemy did not have to strike unfairly enraged Jin, and he beat Ryo into the ground for that temerity, and left him bleeding in the grass. But Ryo needed to learn the skills Jin had developed, to save his friends who had been captured by a deadly Gohma. More than that, he needed to prove himself capable of defeating this man who used those extraordinary talents to murder. And so after forcing himself to a speed and strength he never before had, he faced Jin a third time. The pity of it was that Jin had no idea what was driving Ryo, anymore than Ryo had about what drove Jin. Things could have been so different. Jin warned Ryo that he would kill him this time, even though he felt pity and considerable respect for the strange boy's heart. They fought on the beach and in the surf. Jin used his deadly punch, but his metal fist encountered an unexpected resistance. Ryo was wearing springs, and now he broke them off. And with the springs gone, he was blindingly fast. Faster than the startled Jin. Aki's cry distracted Jin but not Ryo, whose punch sent the assassin flying into the surf. With the battle won, Ryo took off to fight the Gohma monster and save his friends.

And Jin crawled from the waves, weak and in shock. The taste of salt in his mouth, the sting of it in his wounds, the thouroughness of his defeat... it was all too much for him, and his mind teetered. He crawled only to meet Zaidosu, who had witnessed the battle. Zaidosu assured him that it was not that he had failed, but that Ryo had become the stronger. But he could give Jin the power to defeat Ryo. All the human had to do first was destroy his weakness. Then they heard Aki calling, and with a snort of laughter, Zaidosu vanished. Aki found her beloved, and the end of her life. For in his shock he killed her as his weakness. And Zaidosu imbued him with evil, death-power.

But Jin rejected Zaidosu as master and left to learn his new powers on his own, the only way he had ever done things since the day his teacher had cut off his arm. And when he finally succeeded in controlling the forces he had been imbued with, he came back hunting for Ryo. The first thing I noticed was that, while he would smile, he no longer had any light in his eyes. He had killed what remained of laughter and joy in him, and only hate remained. His power had many facets, and one of them was the Spider-attack. His punch injected a special kind of curse-poison. And as it travelled from point of impact to the neck of the recipient, it was shown in the movement of a spider-mark. It created horror and terror, and the greater the recipient's terror, the faster the spider moved. He nearly killed Ryo with it, but the young hero found his balance, defeated his fears, and the two men confronted each other again.

But again Zaidosu was watching the fight, and this time he had brought insurance. A Cannon-Gohma, whom he told to kill the winner of the battle. And though the battle was not quite over, it looked like that would be Ryo and the Cannon fired. But Jin heard the shot coming and leaped between to protect his enemy. The shot took him down, and a stunned Ryo would have gone to him, but Jin protested furiously. He had only saved Ryo because he wanted to defeat the boy in fair combat. No one else was going to be allowed to shoot our hero in the back and leave Jin floudering without a way to prove himself.

Our heroes once again lost track of him. Zaidosu picked up the perhaps dead man and took him home, to wait for him to resurrect. "You were born to be mine," he told the limp form hanging over his shoulder. And he kept Jin chained in a dark, damp cell beneath the Gohma spheres. Maybe he tortured him. Maybe he just left him there with nothing but memories. But eventually Jin killed one of his guards and escaped. Weak from hunger and dehydration, he nevertheless made his way into the human world, searching for Ryo. But it was Ryo who found Jin unconscious. And he took him home to take care of him. You can imagine the shock Jin had when he woke to find himself in his enemy's bed. But he had a one-track mind and challenged Ryo, only to fall on his face without being able to strike even once. For the next several days he was in Ryo's care. The boy cooked for him, was there when he woke from nightmares, and slowly broke through without either of them knowing it. For Ryo had come to realize something in the battles the two had engaged in. He had begun to realize what Jin should have been, and also to realize that something must have happened to warp such a remarkable person into what he had become. And he was determined to unwarp Jin. But what neither man realized was that in the night, while Jin slept, he tranformed into a blood-drinking monster which went out and killed people. Jin figured out something was going on when he woke in the morning to find some sort of calcius growth on his right arm. Ryo on the chair was woken by Jin's horror, and could not understand what had set the recovering man into panic-stricken hiding beneath the sheets. When things calmed down and breakfast had been accomplished, he took Jin out into the daylight in a wheelchair. And at last Jin asked the question that had been plaguing him since waking in Ryo's bed. Why was he doing this?

Ryo fumbled with the explanation, but could only come out with the truth. That he could not bear to see him die that way. Jin was an extraordinary warrior, with honor and courage enough to break a heart. And that at last Jin understood. And he told Ryo to please, if he became a monster, please be the one who defeated him. Ryo was frightened and confused, but Jin told him where to strike, and made him promise. And it was just in time, too. For shortly after that Jin did become the monster, under Zaidosu's control.

It broke Ryo's heart to fight him, knowing Jin was not responsible for what was happening and would never have chosen it. But fight he did, and remembered Jin's words. He struck at that weak point, and Jin with him broke free from Zaidosu's control, if only for a little while. They fought side by side until Zaidosu regained control and turned Jin back into the monster, but the Dairanger used their cannon to break the power again, leaving only Jin. The Gohma retreated. And Jin, though bleeding and weakened by the battle, challenged Ryo. While the others watched in mingled consternation and confusion, the two men squared off a final time. And though they fought, perhaps it's true that neither could fight whole-heartedly. Still, it was Ryo who broke through Jin's guard to punch him, but stopped his fist bare centimeters from the other man's face. He could not bear to strike him. And Jin knew then that there was no way the pair of them could ever test each other fully. Because Ryo particularly would never be able to strike the final blow. He sort of sighed and brushed the boy's arm aside, scolding him gently. And he said his goodbyes. Ryo would rather he had stayed, but Jin could not. He could not lose himself here. Perhaps he was afraid the Gohma would just take control of him again. Perhaps he was afraid staying with these people would destroy his will to fight. But he wished Ryo well, and vanished into the mist.

Zaidosu caught up with him crossing the desert and set the Kottopotero on him. Jin sent his coin spinning into the sky and fought. And probably he was cut down by gunfire, for the coin hit the sand, alone.