In Naruto: Reborn with Talent

Raijin no Ken became famous during the First Ninja War when Tobirama used his incredible Water ninjutsu to soak an entire battalion of ninjas before he discharged electricity from the Raijin no Ken, frying them alive. Tobirama took a shine to the device and used it a lot before his death, making it famous.

Frankly, Tobirama, while good at kenjutsu, didn't use swords much. He was mostly a ninjutsu expert. Raijin no Ken had indeed the reputation of being able to cut through anything but that was mostly because Tobirama was good at lightning shape manipulation and the seals that made up the internal structure of the device so the lighting edge he created through the 'training tool' that later became known as Raijin no Ken was simply strong enough to rival the strength of Raikage's Lightning Armor.

In the hands of Second Hokage, this training tool became an unstoppable slaughter machine. In Aoi's hand though...

Anko inwardly sighed as she parried with her kunai yet another strike from Aoi who was wildly swinging the Raijin no Ken at her. It was all about vibration frequency when it came to the Lightning Chakra and she simply made the lightning coating on her kunai vibrate in frequencies that repelled the pre-set frequency of the Raijin no Ken.

She didn't get the upper hand because she was a better lightning nature user. On the contrary, Anko's main affinity was the fire. She didn't train lightning much, only learning some useful tidbits about the element like the lightning coating. But she didn't need to be a good lightning user when she simply knew how to perfectly counter the sword through its biggest weakness.

Aoi was growing more reckless by the second. The more his strikes were parried, blocked, or redirected, the more his stomach sunk into despair that was slowly gnawing at him. He was one of those people who chose their battles well and didn't engage if they thought they would lose. That was the whole reason why he made Jonin despite there being many chunin stronger than him.

Even his defection was a well-calculated plan. The benefits and prestige he received as a Jonin in Rain Village, a smaller village with fewer jonins, were much better than what he received in Konoha where jonins, while rare, were not all that hard to find. Aoi did his research well before defecting and was proud of his ability to snatch the Raijin no Ken.

With the sword in hand, he cut through most of his enemies or those pricks who opposed him in the Rain village. Before the might of this mythical sword, nobody stood a chance. Then...

'Why?' Aoi tried a downward slash, only for Anko to catch it with the edge of her kunai and gently lead it to the side, redirecting the strike away from her body.

'Why!' Aoi desperately swung the sword in an arc from right to the left, aiming at Anko's hip but the woman just swiftly and fiercely swung her kunai at his sword. The weapons met for a second before they were pushed away and Aoi barely managed to refrain from screaming as his arm was almost yanked from his shoulder due to the sheer force of that parry.

Unknown to Aoi, even Anko felt her shoulder aching from that one. The Raijin no Ken was still a danger to her if she let it land a hit on her body and a kunai was not exactly the best weapon for blocking a sword. She mostly used the repulsive vibrating of their respective lightning element and that, unfortunately, meant that if she hit the two weapons on each other at just the right angle, it would fling them back with a force comparable to Gai's fully serious punch with three gates opened.

It was definitely NOT a pleasant feeling.

Why!?' Aoi mentally cried again as his shoulder screamed in pain. He didn't let himself stop attacking Anko though. He swung and swung and swung... He knew he finally met his match and there was no running away from this one.

He tried to strike at her left hip, only to redirect the trajectory of his sword into a stab mid-flight, trying to use the fact his opponent was using a smaller weapon. Anko had to admit that this tactic would have worked against most chunins too. Sadly for Aoi, Anko was definitely far above chunin-level. She used her considerable reflexes to spot the feint in time and then her arm blurred. The next thing Aoi knew was that his sword stopped. Only then his brain registered that the tip of the Raijin no Ken was trying to futilely push through the side of the kunai Anko leisurely held in her hand. Seeing that, Aoi's expression turned ugly.

"Why isn't Raijin no Ken cutting through your kunai!?" Unable to hold it in, Aoi shouted at Anko with bloodshot eyes, trying to put more power behind his thrust but he felt as if there was an impassable wall between the kunai and the tip of his sword no matter how much strength he exerted.

Anko's brown eyes brightened with amusement. The lightning chakra on the side of her kunai vibrated at a frequency that created a strong repulsive field. Instead of one massively strong push, it was more of a constant effect not strong enough to fling the Raijin no Ken back but there was no way the lightning edge was going through it. The two blades didn't even really touch. The reclusive forces behind them were simply far too much for either Aoi or Anko to surpass them with their physical strength.

'Who would have known I would use science during my fights.' Anko mentally chuckled. She remembered how vehemently she resisted learning about these things when she was under Orochimaru, always saying she didn't need to learn this useless crap. Orochimaru let her be as long as she got better with her poisons, Jutsu, and kept up her physical training to a degree she could still be called a prodigy. Tsunade though...

Anko shuddered. There was no negotiating with that woman and Anko had to relent and learn all this scientific mumbo-jumbo.

'And what a difference did it make...' Her perpetual grin turned a bit sheepish as Aoi jumped back, finally giving up on penetrating the kunai.

"Is that all? My genins put up more of a fight than you." Anko taunted, inwardly feeling pity for the man because she didn't even need to lie in order to get a good taunt. She was basically toying with Aoi, using even less effort than what Sasuke, Naruto, and Hinata made her exert. It was just... sad.

"Shut up!" Aoi he bellowed, his free hand reaching for the umbrella on his back before he threw it into the air. "Senbon Rain!"

Anko stared at the literal rain of Senbon that was approaching her and tiredly sighed. There was no chakra in the senbons, no augmentation, no extraordinary power behind them... "Just normal senbons? Are you kidding me?" Anko wryly muttered, lifting her right foot a bit and letting chakra course through it.

Aoi watched in growing hope as his attack was about to reach the Konoha kunoichi while she stood rooted in her place. He finally got her!

His hopes were dashed a second later when Anko stomped her right foot onto the ground, sending a booming sound through the clearing alongside a shockwave that repelled all the senbons and flung Aoi back, straight into a tree with a resounding crack, snapping his spine and making him scream bloody murder from the pain coursing through his body.

Anko observed her handiwork with a dull gaze, her cheek twitching in dissatisfaction. "Is this why Tsunade focused on healing? This was... anticlimactic." She mumbled, a bit frustrated that the fight ended so easily. One chakra-enhanced stomp? That was it? The guy was supposed to be a freaking Jonin! She expected him to dodge!

Releasing a long sigh, Anko walked close to the screaming Aoi, noticing that not only was his spine broken, he also had a few new holes in his body. The strength of her shockwave was enough to make the senbons that hit him go right through him. The man was just lucky none hit anything vital.

Crouching down, Anko leisurely gathered the Raijin no Ken that lied next to him before pushing her lightning chakra into it. The sword pulsed before a strong current of lightning was generated, making an edge far better than what Aoi was capable of. If Rei saw it, he would be reminded of a miniature chainsaw made of lightning condensed into a lean blade.

Anko's eyes met Aoi's frightened gaze, making him silent in fright as he realized what would follow. After a tense moment, Anko decided she gave the guy enough time to make a peace with his demise and swung the Raijin no Ken, causing Aoi's head to separate from his body.

Looking in apathy at the blood gushing from the neck, dirtying the ground, Anko couldn't help but lament her choice of opponent. "I hope the kiddies and Kakashi had more fun than me...."