Hidan's immortality was even more extensive than Sakura had initially imagined when she'd first watched the anime. He could easily survive beheadings, cuts and stab wounds that would be lethal for even the hardiest shinobi, but even that paled in comparison to regenerating from what Shino had done to him. Somehow, Hidan had survived having the entirety of his flesh devoured by parasitic bugs.
Ew.
So, short of incinerating him, grinding his skeleton into dust and scattering his ashes to the four corners of the world, Sakura had no idea what it would take to bring him down for good… but the point was moot, since Hidan's immortality was not a problem in itself; he remained a threat only so long as his limbs and head were attached to his torso.
"Damn it!" Hidan swore, swinging his weapon wildly and slicing through several toilet stalls. "These walls are getting in my way!"
Sakura ducked, her breasts flopping into her lap as Hidan hurled his triple‑bladed scythe at her. The weapon embedded itself in the wall behind her, remaining there only a fraction of a second before Hidan yanked the metal cable tied to the base of the handle, sending its three blades singing towards her back.
As their blades faced inwards towards the wielder, scythes were not the most efficient of killing weapons, but Sakura was well aware that attaching a chain or cable to the farming implement to transform it into a kusarigama, capable of being thrown and pulled back, solved this problem quite easily.
By the time the scythe's teeth released from the wall, she was already rolling out of the way.
"Saimingan: Sharingan Genjutsu!"
Hidan locked eyes with Sakura and froze where he stood, but his own scythe was still spinning through the air towards him. The three blades sank deep into his abdomen, and blood burst forth in a dark torrent, spilling across the polished tiles in a widening pool.
"Ooh, that hit the spot," sighed Hidan, his eyes growing clear once more. "Give me more…"
"What are you waiting for?" Sakura yelled at the two remaining kunoichi, who were still hesitating over whether to finish the job. "Get out of here and call for help! The Akatsuki are here!"
The Akatsuki attacking their target was far beyond their job description, and they had no doubt they would be drawn into the melee if they stayed. And as long as Sakura died, it hardly mattered by whose hands it happened, did it? They nodded to each other and ran out of the toilet past Hidan, who was still revelling in his self-inflicted pain.
"Genjutsu, eh?" said Hidan, freeing his scythe from his guts and giving it a twirl to remove his own blood from its blades. "I won't fall for that one again derrrr…"
Hidan had once again made the mistake of meeting Sakura's gaze, and she had hypnotised him once more, freezing him in place. Even though his mind was consumed with prayers to Jashin, he was not immune to Genjutsu as Kakuzu was, which should have made this fight a cakewalk— or so Sakura thought.
"SHA!" Sakura screamed, as she rushed at Hidan, wreathing her fist in chakra.
Time seemed to slow down to a crawl, her triple tomoe spinning rapidly in her eyes as she noticed the corners of Hidan's mouth curl into a faint smirk. A nearly invisible trickle of blood ran down his black trousers… because he had stabbed himself in the thigh with some kind of stake, barely visible as it protruded from his sleeve.
He was using pain to clear his mind!
"Gotcha!" Hidan laughed, suddenly willing himself free from paralysis.
Like the blade of a guillotine, the triple-bladed scythe came slicing down towards Sakura's head, poised to cleave her in two. It was too late to stop her momentum, too late to throw up any kind of defence that could resist Hidan's sheer might…
Unless…?
"TURN IN QUEST!" Sakura bellowed.
A long time ago, the System had issued her the following mission: if she could obtain Samui's breast chakra, five deep-seated grudges born from having one's breasts stolen, and at least a shard from Hidan's scythe, Sakura would be able to redeem a cursed technique— a Jujutsu.
Gatō's prostitute from the Land of Waves.
Munekichi and the two other Manyū guardswomen who had failed in their jobs.
The kunoichi with the twisted ankle.
Sakura had already gathered the necessary five grudges and a small piece of Samui's breast chakra (the rest she had stuffed inside Karui), so all she had been missing was Hidan's scythe. And now, with that very scythe bearing down upon her head, Sakura could only hope with all her heart that, despite the System's disappearance, she would still be able to turn in the quests she had already unlocked…
"Divine punishment!" shouted Hidan, laughing madly.
Sakura felt a jolt as the scythe's three prongs made contact with the top of her skull… and then nothing. She looked up at Hidan, whose twitching fingers closed around nothing but air, and for a moment, they stared at each other in disbelief. The System had actually accepted the entire scythe and swallowed it up!
But there was no familiar ding, no synthetic voice, only pure data.
Sakura groaned and clutched her head as information specific to the Jujutsu the System had deduced for her forced its way into her mind. The System's AI personality was still nowhere to be found, but at least its user interface and core functions remained…
"What the hell!" shouted Hidan. "What did you do to my beloved scythe!"
Furious, Hidan kicked a defenceless Sakura in the stomach, sending her crashing into the sinks, where she remained downed. Water spouted from the broken pipes, drenching her in cold water. Sakura's body was not built for withstanding direct hits; apart from a thin layer of subcutaneous fat and her abdominal muscles, there was nothing protecting her internal organs from blows.
"Ugh…" Sakura moaned in pain, curling up and clutching her belly.
Since she had unlocked the use of all 361 of her Tenketsu, Sakura could expel chakra from wherever she pleased on her body. If she knew she was going to take a hit, and that she wouldn't be able to avoid it, Sakura would usually expel a touch of chakra from the targeted area in advance to soften the blow, but with information flooding her neurons she had not been able to do so.
Dazed and lying on her side, Sakura could only watch through the sheet of water cascading from the broken sinks above her as Hidan's feet drew closer, splashing through the pool of bloody water gathering on the floor. At least he wouldn't be able to draw his sigil on the floor like this, so her death would come quickly and without too much torture…
"…Gah!"
Sakura couldn't summon her chakra fast enough to heal.
The imaginary organ that would have rested within her midsection, the endpoint of every chakra pathway, the nameless knot within the network that one could only refer to as the dantian, visible only through the Byakugan's piercing eyesight, had been reduced to a formless mash of mangled internal organs by Hidan's vicious kick.
Without chakra, she had no other choice but to use that.
"Jujutsu: Thousand-Armed Deprivation Grudge Manifestation."
With difficulty, Sakura lifted a hand to her bulging breasts and raked her nails across her chest… but instead of blood, darkness oozed from the wound, bubbling and feeling its way out like tentacles…
"You think… you know pain, Hidan…?" Sakura whispered hoarsely, choking out blood with every word. "Can you… hear their voices… cursing us? Can you feel… their hatred? Then enjoy… the despair of those… who have had… their breasts… stolen away…"
Darkness filled Sakura's vision, and her head lolled to one side as she sank into unconsciousness.