An S-rank ultimate technique!
Koshino's trump card was actually the S-rank ultimate technique he had mastered long ago—Wind Release: Rasenshuriken!
Because Koshino was familiar with the original storyline, he had known early on about the unique properties of the Samehada sword wielded by Kisame Hoshigaki, the future partner of Itachi Uchiha and a member of the Akatsuki. Therefore, when facing the current wielder of Samehada, Kisame's predecessor, Koshino had never intended to defeat him with just a simple Wind Blade to resolve the Sharp Blade Squad crisis.
In other words, the Shadow Clone Technique and Shadow Imitation Technique were merely setups for his final move!
At this moment, the brilliant blue chakra gathered in Koshino's left hand revealed the true killing blow he had prepared to take down Kisame Hoshigaki!
However, as Koshino slowly gathered his trump card, Kisame wasn't idle either.
The ability to unleash potential in moments of despair and maintain composure in the face of formidable enemies—Koshino's talents made even Kisame feel a chill. So, while Koshino was forming the Wind Release: Rasenshuriken, Kisame was struggling against the restraints of the Shadow Imitation Technique, trying to use the Samehada to break free. After all, just sensing the S-rank ultimate technique Koshino was preparing gave Kisame a bad feeling.
But in this race against time, Koshino wasn't the only one under pressure; Kisame was too.
Koshino had thought that with the help of the APP's accelerated training effect, mastering the technique to throw the Rasenshuriken would mean using the regular Rasenshuriken wouldn't be a problem.
But he was completely unprepared for how difficult it would be when he actually began to form the Rasenshuriken!
"Damn it!"
"Even if I've mastered a technique, if I don't have enough chakra, it can still backfire!"
"Wind Release: Rasenshuriken really deserves its reputation as an S-rank ultimate technique!"
"It's so hard to use in my current state!"
First, he used his blue chakra to create the form of a Rasengan. Then, as he tried to apply wind nature transformation, Koshino realized he didn't have enough chakra.
No wonder—having just unleashed his potential and fought Kisame for several rounds, Koshino's chakra was nearly depleted. Moreover, the Wind Release: Rasenshuriken requires a massive amount of chakra as its foundation, and Koshino's total chakra reserves were only comparable to those of an average chunin. It was no surprise that using the Rasenshuriken was proving to be a huge strain.
Fortunately, Koshino's breakthrough had put his in a state of half-step "qualitative" transformation in his spiritual energy!
So, with ample spiritual energy, although forming the Wind Release: Rasenshuriken was challenging, Koshino managed to successfully complete the S-rank ultimate technique in his left hand!
Buzz!
Buzz!
As the Rasenshuriken formed, the sound of its sharp blades echoed throughout the once-silent cave!
The mere sound of those blades was enough to make everyone present—Shisui Uchiha, Juzo Biwa, and others who were not engaged in battle—feel the terror of the S-rank ultimate technique. Kisame, who was facing Koshino directly, was even more alarmed.
With his eyes fixed on the strange white light swirling in Koshino's hand, Kisame hastily swung Samehada down onto Koshino's shadow clone!
In an instant, Samehada displayed its power, directly absorbing the chakra that Koshino had used to create the shadow clone.
Naturally, the Shadow Imitation Technique that Koshino had been using through his shadow clone also lost its restraining effect, freeing Kisame!
But! It was too late!
Thanks to the restraint provided by the Shadow Imitation Technique, Koshino had successfully completed the Wind Release: Rasenshuriken!
As previously mentioned, Kisame was never known for his speed.
So, the moment Kisame broke free, Koshino's lips curled into a faint smile.
"Die!"
"Wind Release: Rasenshuriken!"
Koshino hurled the Rasenshuriken towards Kisame with all his might!
Under the intertwining blue and white lights, with the buzzing of the Rasenshuriken's blades, Kisame had no chance to escape. The Rasenshuriken enveloped his body entirely, whipping up a fierce windstorm.
However, Koshino's Wind Release: Rasenshuriken was clearly used under strain and didn't have the same overwhelming power as the one Naruto Uzumaki used in the original story.
Otherwise, the cave where the Sharp Blade Squad was hiding would have collapsed under the might of the S-rank ultimate technique, burying everyone inside.
Even so, when the second-stage explosion of the Rasenshuriken triggered, tiny wind blades pierced through Kisame's body in an instant. Seizing the moment while the technique's second-stage power immobilized Kisame, Koshino, now almost out of chakra, quickly regrouped with Shisui Uchiha!
"Shisui, Kisame Hoshigaki shouldn't be able to chase us anymore! We need to break out now!"
Hearing Koshino's voice, Shisui, still unable to sense anything in the Bloody Mist Technique, was momentarily stunned before nodding firmly in Koshino's direction.
Without a doubt, the future "Shisui of the Body Flicker" was astonished!
No one could have imagined that Koshino would be the one to turn the tide and prevent the complete collapse of the Sharp Blade Squad!
Quickly, Koshino hoisted the lightweight Kakashi onto his back while Shisui carried Fierce.
With Koshino's Shadow Communication Technique still connecting them and relying on his remaining chakra to maintain his Wind Sensing ability, Koshino led Shisui and the other members of the Sharp Blade Squad towards the cave's exit. The fallen Kisame Hoshigaki, lying in a pool of blood, was no longer something Koshino could concern himself with.
After all, leading the Sharp Blade Squad to safety was the task that Koshino had to complete.
Whether Kisame was alive or dead was something even Koshino couldn't ascertain!
Quickly, using his Shadow Communication Technique and the miraculous effects of Wind Sensing, Koshino led the entire Sharp Blade Squad to the cave's entrance. But as soon as they reached the entrance, Koshino found himself unable to continue leading the squad out.
Because right at the cave's entrance, several Mist jonin under Juzo Biwa's command were blocking Koshino's path!
Just as Koshino, now almost out of chakra, locked onto the Mist jonin's figures with Wind Sensing, gritting his teeth as he pondered how to deal with them, a sudden "ding" sounded in his mind. The initially troubled expression on Koshino's face was quickly replaced by another confident smile!
Clearly, at the very moment when Koshino and his squad were about to face a new threat from the Mist jonin, the APP's sudden voice in his mind had become the key to whether the Sharp Blade Squad could successfully break through!
"APP, you're just in time!"
"If it weren't for this new secret technique, taking down these Mist jonin would have been a real headache!"