At the age of 17, Horie Kohaku would finally go to fulfill his promise, to eradicate his own clan...
His heart was beating fast in anticipation as he was walking through the woods, getting closer and closer to the familiar gates to his clan. He clenches his fists, feeling a bit of dread of what he is about to do, but he knows himself that there is no point of return, he has made his mind already.
As he finally reaches the destination, he walks inside, his eyebrows narrow as he sees his uncle Jubei in front of the door of his house, having a mocking expression. Horie felt his heart beating faster, the uncle smirks, and before Horie could say anything, his relative says:
– Well well... would you look at that... Mrs. Kohaku came back because she desired a death wish... you look so pathetic... he gets up of the ground, became a samurai and now think you could take the whole world all by yourself.
Horie remains expressionless, but had a hint of disgust and hatred on his face, it was clear he hated his clan with all of his heart. Without warning, Jubei pulls his sword and advances towards Horie while activating his Tenmetsugan³ (Visual prowess inherited by the Kohaku clan. It allows the user to manifest their imagination into reality—but only within the limits of their current barrier. There are four barriers, each one expanding the scale and complexity of what can be created. However, the mind and body cannot fully withstand this power. Overuse leads to hallucinations, loss of vision, brain damage, and ultimately death), his eyes sparkling as his pupils grow and white-like rings surrounding the uncle's eyes, but Horie quickly looks away in order to not get caught in his innate ability and dodges his attack, swiftly pulls out his Katana and slams him in the back of his head with the pommel, and steps on his back. Without thinking, out of adrenaline and recklessness, Horie grabs Jubei by the head and rips his eyes out and the blood splashes on his sleeves, making the uncle scream at the top of his lungs in excruciating pain.
Horie gets up and violently steps on his face, obliterating his head into million pieces, his own hands form mouths which consume and absorb the Tenmetsugan eyes within Horie's body, and by this point, Horie would already open the last barrier of his Tenmetsugan while walking inside the mansion of his clan.
As he gets in, he is already cornered by tens of ninjas, Horie gulps, he grips the Katana tighter but walks forward, and in a second, he starts slaughtering through the ninjas around, spilling blood and guts everywhere, but before he could continue on his massacre, a katana is thrown and pierces right through his chest, shocking the samurai. He stands... frozen, a sense of fear creeping over his spine, and as he looks up to the second floor, he sees... his father.
He couldn't do anything, not even react, as all of the other rookie ninjas stab him with their blades. The ninjas started chuckling, but before they could say anything, they felt like a weight was added on their backs, the whole hall started trembling beneath them, and every single one of them realize they have been caught in his Tenmetsugan Technique, meaning that this was all fake, and instead of stabbing Horie, they would have all stabbed each other and fall on the ground.
– I am shocked... Horie mutters coldly.
The father started chuckling maniacally as he was walking down the stairs towards Horie while applauding:
– Of course you are... you could never reach that level of power! He laughs.
– No, I am actually shocked you thought you could kill me with that loser shit. He replies with a hint of anger and coldness.
Before his father could do anything, Horie was already behind him, and slowly, the father's head falls off, and the body too afterwards.
Horie takes the head and gouges his father's eyes out as well, absorbing them.
As Horie's mind was to go after the head of the clan, he suddenly feels something piercing through him, it was a Tenmetsugan ability which pushed him through the walls of the mansion all the way outside, and as he slowly looks up, he sees his two older cousins, Kohaku Haruki and Kohaku Yuzuki, these two were brothers.
Horie gets frustrated but decides to quickly rush towards them, clashing his blade with their, he pairs a few blade hits and slices Yuzuki's body in half, her organs slipping down and blood spilling on Haruki's face, making him freeze, giving Horie the advantage to kick him straight in the face and sending him flying.
Horie quickly steals their eyes aswell and absorbs them, his Tenmetsugan evolving into the Kakuseigan⁴ (A state beyond the four barriers of the Tenmetsugan. It removes the natural limitations of the eyes, allowing the user's imagination to manifest without restriction. However, the human body cannot withstand such power — overuse leads to hallucinations, blindness, brain damage, and ultimately death. This state can only be achieved through the absorption of multiple Tenmetsugan eyes).
When Horie looks up, the first thing he sees is The Head of The Clan standing in front of him, Kohaku Makoto, the man was almost twice taller than Horie, he was bald but very muscular and had a white uniform on.
– You have impressed me, child. You have managed to kill everybody in this clan, but that doesn't mean there are not going to be consequences to your actions... You have commited a genocide.. the figure says with a firm deep tone.
Horie felt his anxiety growing again, this was it, the moment of truth, to prove to his dead sensei that he was capable of ending the Kohakus once and for all.
He tries using his Kakuseigan but it was late, his opponent already grabbed him by the throat, and in a swift move, he has ripped one of Horie's eyes out, Horie screams in pain but quickly kicks the tall figure away, and slowly covers with his hand the place where his eye had to be.
The boy quickly rushes towards the leader and tries slicing him, but Makoto dodges so as a trap, Horie uses his Kakuseigan one last time and summons 23 Katanas piercing through the man's back, killing him, but at the cost of his own sight.
Horie slowly walks towards the corpse and consumes the Kakuseigans, recovering his eye and evolving his Kakuseigan into the Shinjitsugan⁵ (The ultimate evolution of the Tenmetsugan. It allows the user to surpass all previous limitations, wielding their imagination with near-absolute freedom. Unlike earlier stages, the physical consequences are nullified—but at the cost of the user's humanity, as their perception of reality begins to distort beyond recognition. This state can only be attained by consuming another Kakuseigan user, and only by those who have already awakened it themselves). The samurai sighs a bit but then abruptly throws up blood on the corpse, the side effects from the hit he has taken so far kicking in.
Horie slowly gets up from the ground and walks back inside the mansion, to finish what he started, chopping down everybody, women, children, even his own mother. He felt guilty killing every single one of the innocent people in the clan, his heart breaking, but he knew there was nothing he could have done, the Kohaku clan had to disappear and never be heard.
As he is slowly leaving the mansion after all of the events that happened, from afar, there was Etsuko waiting for Horie. As Horie reaches her, he falls on her shoulders, and Etsuko catches him and helps him walk.
– There. You went overboard today, let's go back to our base and relax...