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Chapter 1: Promise

               The final battle Between Demon Slayer has started, The Stone Pillar-Himejima Gyomei, Wind Pillar Shinazugawa Sanemi, Mist Pillar-Tokito Muichirou, Water Pillar-Tomioka Giyuu, and Shinazugawa Genya were fighting uppermoon one, Kokushibou.

As the earth is quaking pretty hard, the wind feels cold as it stab through the bones. Everything is chaos, everyone their life in this battle. The pillars finally made their sword shining red, the battle become more fierce, and they even putting their life in every second and every swing on their weapons.

More than one hour, the battle finally end, sacrificing Shinazugawa Genya, Wind Pillar's younger brother that being sliced into half vertically, end up turn into ashes as the Demon's Death. Then The mist Pillar, Tokito Muichirou who have fatal injuries and cannot be saved anymore.

Every pillar is in grief, they cannot block their tears, but they need to go next fighting the Demon King, Kibutsuji Muzan. On that place, the Kakushi and the cleanser army start treating wounds from Pillar (Hashira), The Pillar only get their first aid and immediately run to next battle, they run as fast as they can to catch up to Muzan's Battle.

Wind Pillar put a stance and run like catapult, he run as fast as storm bring the air blow strong to Kakushis. Followed by The Stone Pillar and Water Pillar, they run as shocking rock, gives little quake and run as fast as High Waterfall.

The Kakushi was stunned seeing Pillars power after their wounds, with amazed and confused expression, one of Kakushi said "Crazy, with all of their injuries, they still can run as that fast!"

               The other hand, The Kakushi continue cleaning the field and bring Tokito Muichiro's body, and many things that could be brought back to honours the warriors, and being buried to other demon slayers being buried.

               Among the Kakushi, there is a girl who help them. She was one of Demon Slayer. The girl was a mystery, with striking dark purple eyes that shown out from a face that expressionless as a polished mirror. She seems in another world entirely, and wore a black suit same as Demon Slayer that perfectly fit in her body, along with purple haori that had a cube-shaped ornament on it. The haori glinted in the dim moonlight, making her look all the more otherworldly. She is Sena Hazuki, Tsuguko (Pillar Successor) of Uzui Tengen.

               At her left waist, she carried katana with a blade that shone in deep rich purple hue, matching the colour of her piercing eyes and haori. She also have small knife tucked in the pocket on her left hand and right thight.

               Though she appeared to be calm and quiet, her eyes implied a storm of emotions and thoughts swirling within her, as if she had many voices speaking in her head.

               Despite her distance and seeming lack of emotion, there was sense of sorrow and detachment about her, as if she had shut herself off from the world. It was hard to say what had made her into the fearsome warrior she was today, or what secrets she was keeping behind her emotionless mask. However, there was something beautiful about her that reflect the eyes that pull attention.

Walking near to Kokushibo's body that start to banish turn into ashes. She fold her knee and approaching pieces of Kokushibou's cloth and haori.

               She lend her hand, on a kneel position, pick up a little piece of haori coloured purple similar as Sena's Haori, she get up looking at the haori in her hand, with flat eye sight for a moment. With deep soft female voice, she uttered a sentence with flat tones "The moon breathing isn't totally empty, your breathing technique will remain, under the shade of moonlight. At least that's what I can hold in my hands"

               "As sign of my admiration to you, even when you dragged into demon's influence and finally fall to ocean of regret, I shall pass on inheritance of the Breath of Moon technique, and hoping connected line to next generation, so that your legacy will remain, gran grandpa"  

               As the sentence came out from Sena's pink lips, she carried within her the legacy of Kokushibou also known as Michikatsu Tsukiguni, which had been passed down through generation of her bloodline alongside that of the Tokito family.

               The Kakushi is finished their job cleaning, carrying Tokito's body to be buried tomorrow. In this stance, Kakushi ask to Sena to join the final battle defeat Muzan. With her flat eyes and plan cheeks, she look at the Kakushi who ask her saying yes to join battle.

               They running through the same way as Pillars through. Sera control her breathing to keep her stamina up, even she know she already strong enough to run as far reach Muzan, she wanted to keep her stamina as much as possible, she believe that through this way, there is any possibility that demons will appear to catch them and block their way.

               Sena's prediction was right, there are more than 40 of demons appear blocking their way. Sena's with gazing eyes, little shouting to Kakushi

"Keep running forward! No matter happened do not turn back! I will make your way! Run until you reach Pillars!"

The Kakushi with little worried in her face answer Sena "What about you?! Please do not die Sena-chan"

"I will not die, facing those demons, anyways I need to try something" answer Sena with confident that show thinly in her flat face.

Sena taking her katana that shining in rich purple under the moonlight with her right hand along with her left hand taking small knife from her thight, put herself in full concentrated breath mode and unleash her technique.

"Breath of sound-Fourth Form, Song of the dragonfly"

The demons who focused to attack Kakushi suddenly disturb by Sena's Breath technique that produce dragonfly sound from her little knife and her katana that hanged some kind of metal that produce the sound.

She jumped between demons to demons and cut their head, one by one head being catted of from their head out smile little in Sena's face. The Kakushi continue running and left Sena alone, hoping she will be alright.

The battle between Sena and the demons taking long time, Sena still standing strong facing the demons, but seems the demons have plan to attack Sena in every angle. The situation is really bad for Sena who holding her sword with single hand and little knife.

Without hesitation, she drop her little knife, within second moment while the demons are jumping towards Sena, she put a stance that startle the demons, but they cannot cancel their attack in sudden time.

Sena, take deep breath, fully concentrate with her body and observe the battlefield. She holding her katana with two hands, straight swing with unbelievable speed. As it flash before their eyes, the slice of Sana's katana were so precise and as easy as cutting bamboo leaves, the precision more likely not letting single drop missed and touch the ground. With fear and surprised face, the rest of the demon lost their head.

"Breath of Moon- Tenth Form: Drilling Slashes, Moon Through Bamboo Leaves" the technique creates a long-ranged triple-layered slash twister full of crescent moon blades.

               She smiled as proud and psychopathic face, proud of herself success using Moon Breathing technique to her real battle. She immediately continue running into final battle between Muzan.

               She feel hard in her lungs because of unperfected Moon breathing technique she used, and her hand is numbed for a moment, she say to herself "Damn, that technique is really hard, I feel like I will lose both of my arms"

               In her halfway, she look the sun almost dawn, she fastened her run hoping she made in time to the battlefield between human and the Demon King, Kibutsuji Muzan.