Hidan had always been fascinated with the stories of a particular clan since childhood. The Chinoike clan possessed a dojutsu even stronger than the sharingan of the Uchiha clan; it was called the ketsuryugan and its abilities involved blood control.
Hidan loved bloody things so it was only natural that he admired the people for their visual abilities. The Chinoike clan were banished from their home village, Kumogakure, to Jigokudani or in more common terms, the Valley of Hell, after a grave offense they committed. Or so Hidan heard.
Jigokudani lay on the borders Hidan's village occupied between the Land of Fire and the Land of Water and it was by no means a hospitable place to inhabit. He had heard stories of it (the place was off limits so he hadn't actually been there).
All of the minerals that made up the hot springs in Hidan's village, the Hidden Steam, were concentrated in that valley, causing all forms of life to cease. There would be no source of food for the banished clan as well as drinking water because of this reason.
A few months after the Chinoike clan's banishment, the elders and council members of Hidden Steam village gathered a group of ninja to check up on their wellbeing. Hidanwished he could have gone with them but he was dismissed for his belief that the foreigners should be killed lest they impose a threat on the village.
It was their job as ninja to protect the village and that meant killing and blood spillage. However the stupid village head thought otherwise and wanted to take a more peaceful approach instead.
Hidan went off to Jigokudani on his own after the ninja troop returned with shit reports about the Chinoike clan drinking blood for survival. He had no problem with it but he wanted to see for himself, out of curiosity, how the once prestigious clan was doing.
The strong, foul stench of sulphur was the first thing to welcome Hidan into the valley. The silver haired teen ventured deeper into the place and saw, like the troop reported, a pool of blood and another thing they failed to report; corpses.
Hidan went to investigate the bodies sprawled haphazardly on the arid floor and discovered that none of them had open wounds that could spill and form a pool of blood. The 'pool', Hidan concluded, was just Jigokudani's mineral infested water.
The iron content in it was so much that the water was red. He was guessing this was what the troop from Yugakure (Hidden Steam) saw them drinking and came up with the wrong conclusions.
When he went back to his village and told them about his discovery they immediately assumed that the Chinoike clan died from how unfavorable their living conditions were, which lead Hidan to correct their assumptions.
The corpses he found were not skeletons but actual fresh corpses. The people of Yugakure suspected Hidan for the mass murder. Their suspicion was not far fetched with the silver haired teen's strong belief in bloody murder but while Hidan might've felt that the foreigners be killed, he was not behind their annihilation.
The Chinoike clan did themselves in if the curled blood remained in their corpses was any indication of their dojutsu's abilities. The villagers stayed away from the silver haired teen but it was okay because he didn't want to mingle with the peace loving freaks anyway.
Hidan found Jashin after that event or more accurately, Jashin found him and showed him the way. No longer was he a bored, lame ninja of a village that had no life. The silver haired teen followed the holy book of Jashin with heart, giving human sacrifices and praying fervently until he gained the god's gift of immortality.
It took a while to learn about how his new abilities but when he did, it was time to spread salvation all over the shinobi nations. Hidan started small from his neighborhood but they didn't want to come into the light of Jashin. They tried to talk him out of it, to convince him to be contented with the new village system, so he killed them.
Be contented with the new village system? What a joke. A ninja village was meant to kill and plunder, not be a tourism center for other shinobi nations. This is why he converted to Jashinism; everything that didn't involve blood spillage was a grave sin.
Hidan felt good killing his neighbours. The confusion on their faces when he stabbed himself in the heart was thrilling and even more, the look of agony on their faces when they realised that they were the ones dying and not him. It was so euphoric!
After killing them he prayed on his talisman (a necklace with the symbol of Jashin as its pendant) and struck a line across the emblem on his headband with his weapon. It was a handy weapon, really. A three bladed scythe with tips sharp enough to cut skin at even the slightest contact. It's main purpose wasn't for offense but for to collect blood which, if you haven't guessed, is the main constituent of Jashin's rituals.
Hidan left Yugakure after he killed his neighbours. If they didn't want to accept Jashin as their god then he would kill them and go to another place in search of actual willing participants. By the time the year was over, Hidan had killed more people than he did in his whole time as a ninja.
None of the people he called to answered his beckoning. They weren't worthy to be left alive. He was on the way to the land of tea when he met the particular group of people called the Akatsuki. Hidan met an old guy on the way and stopped him.
"Hey you!" He pointed his three-bladed scythe at the terrified man. "Do you want to come into the light of Jashin?"
For a moment the old man looked confused. Then he relaxed when he realised that the silver haired man in front of him was just an overzealous religious practitioner and declined the offer. That struck a cord with Hidan who raised his scythe without further ado.
If the old geezer would not accept Jashin he could as well gain a fast ticket to the after world.
The old man shrieked when he saw that Hidan was going to strike and to run away from the weapon's reach. What he wasn't expecting was for the scythe to have a long steel cord attached to its hilt which made it extend to reach long distances.
One of the blades scratched his shoulder but that was all Hidan needed to sacrifice him to Jashin with. He withdrew the scythe and licked the blood off the blades. Immediately his skin changed to a black and white skeleton esque colour and he drew Jashin's symbol on the ground with his feet.
Once the triangle embedded in a circle was done, Hidan gave a sadistic grin as he watched the old man hobble away in fright. He did not anticipate the sharp pain in his leg when Hidan stabbed himself in his own leg.
A sadistic form of glee washed over Hidan as he watched the man shrivel and agonize until he died. He was on his way after offering the old man as a sacrifice to Jashin. However, his journey was cut short when a bunch of shady looking people blocked his path.
They looked like they belonged to a band with the stupid cloaks they branded. Hidan's notion about them changed when one of them lunged at him and attacked him. It took him by surprise so they got his heart. He doubled over because while he might be immortal he still felt pain.
They must've thought they had him if the surprised look on their faces was anything to go by when he stood up straight after the pain haze faded. "That hurt like a bitch, bastard!" He cursed and lunged at the one that attack him.
He was some weird looking bulky guy that had a shawl hide his face from below his eyes and strange pink corneas instead of normal white ones. Not like Hidan cared when he slid his short sharp rod that he always carried around for rituals through the motherfucker's heart.
The man was still for a while until he suddenly spoke despite the rod impaling it. "So you're immortal." His voice was barely louder than a mumble but still audible enough for Hidan to hear.
If he was surprised that this person was also immortal he did a good job of hiding it because Hidan cracked a wide maniacal smile. "You're also immortal." He stated.
"Join our organization." One among the other two the immortal man came along with, the girl, spoke. She rambled some things about world peace but Hidan was not listening. As long as he got to kill as he liked and the immortal man was with their organization, he was down for it.
Hidan was glad he joined the Akatsuki because he got to make many sacrifices to Jashin. The peasants deserved what was coming for them when they refused his offer.
He didn't expect to end the way he did; decapitated and buried in a hole to stay underground forever. That was one major weakness of his Jashin given abilities. If his head was detached from his body it remained limp until his head was attached back.
The boy got him good. What was his name again? Hidan didn't for the love of Jashin remember. His thoughts wandered wild and free the longer he stayed. Did they get Kakuzu, his immortal partner? Yeah they must have if he wasn't coming to help him. That or he was being a dick as always.
Did his preaching reach some people at least? Hidan doubted that since he killed the people he told about Jashin upon their first refusal. Maybe those he let escape? Would somebody else find Jashin's scroll and get initiated?
Unfortunately for Hidan, all of his thoughts were left unanswered.