Shun Sato

Overview

Shun Sato is the Lord of the Tower, known to the public as the Devil of the Tower and remembered as the third hero of the Demon War. Accounts of him divide sharply: some describe a kind, charismatic young man; others a devilishly cunning monster. He is the father of Ryuji Sato and Mimi Sato, served at the Tower by Zero.

The prologue records his intervention in the First Transgression, where he defeats Victor the Third’s invading army, and later in the Hikari Civil War, where he turns Satomi’s battle against Arata. Magnus punishes the latter breach, after which the Tower closes for a month. In His Return, Shun comes personally to the school, declares Ryuji guilty, defeats the students and their parents who oppose him, and takes his son back to the Tower.

Connections

Shun connects the Tower household to the world’s largest political events. His old ties to Elian, Reiko, and Kimiko collide with his role as Ryuji’s father, making his arrival the volume’s decisive rupture.

The fugitives at his gate

Years before the school crisis, Satomi Hikari and Yumi Raijin reach the Tower wounded and pursued by the Black Hand. Shun initially refuses to involve himself in another human conflict. He changes course when Yumi offers anything in exchange for Satomi's life, accepting her service as the price of sanctuary while Mimi Sato heals both women.

Yumi later attacks him after seeing his demon form at dinner. Shun restrains her without striking and condemns the fugitives for bringing assassins and war to the home he is trying to protect. Their hostility develops into repeated training in the courtyard. Shun fights through instinct, shadows, puppets, and lightning; Yumi answers with disciplined paired blades. The clashes break physical boundaries while creating a private trust neither expected.

Love, promise, and rupture

During the six-month refuge, Shun and Yumi spend increasing time beneath the Grand Tree, where she plays a flute carved from a broken branch. Satomi recognises their growing love before either resolves it. When twenty thousand loyalists are ready, she asks Shun to keep Yumi at the Tower while the queen slips away to war. He promises.

Shun tries to honour that promise by deceiving Yumi and, when she discovers the departure, by physically preventing her from following. Yumi insists that her oath to her queen and her right to choose her own service outweigh his protection. He calls himself the accursed Devil of the Tower and uses his power to hold her, but releases her when her anguish makes the cost of the promise undeniable.

Indecision in the mountains

While the armies converge, Shun lies in a hammock high within the lonely mountain range, sunk in sorrow and unable to quiet his own thoughts. He is addressed from within his own shadow by Ryosuke — unnamed at that point in the story, and identified only in Chapter 19 — who asks whether he is certain of his choice.

Shun answers that Satomi chose her path and he chose his, but the presence tells him plainly that he hesitated and that his stalling will get people killed. When it predicts that he will defy Magnus despite himself, Shun reacts with uncharacteristic terror rather than anger, insisting that he cannot defy Magnus again and cannot throw away everything the household has built. Bitter memories of war and love are stirred by the exchange, and the narration confirms that he privately knows the shadow is right — that he cannot afford to lose someone precious a second time.

Intervention at the Battle of a Thousand Shadows

Shun arrives on the battlefield at the moment Arata Hikari brings his sword down on Satomi Hikari and the unconscious Yumi Raijin. He intercepts the stroke, driving Arata back several paces and visibly breaking the usurper's plan.

He is described standing between the siblings as a towering figure with long black hair tipped in crimson, holding his drawn blade in a master's posture and forming an impenetrable wall of steel. Satomi identifies him aloud as Lord Shun. The published story ends at this point; his intervention is established as a fact, but its conduct and consequences — including the treaty implications he had feared — are not yet shown.

Breaking the treaty

Shun's intervention at the Battle of a Thousand Shadows is an open breach of the neutrality the Tower is bound to. Arata names the breach aloud and warns that the other kings will not stand for it; Shun answers that he does not care about treaties or kings. He gives his motive plainly and only once: Arata hurt a member of his family.

On the field he shows abilities the published story had not previously demonstrated. He calls Mimi Sato and Ryosuke up out of his own shadow; he transforms, growing horns and a tail with his eyes burning crimson; he spreads his shadow across the plain and raises hundreds of shadow puppets from it, which fight independently and can emerge from other people's shadows; and he shadow-steps himself, appearing behind the enemy general to behead him. He drinks the dead general's blood in front of both armies before demanding their surrender.

He also breaks the enemy's will deliberately rather than destroying the army, announcing Arata's death and the manner of it and offering the same fate to anyone still armed.

The war behind him

Walking to the front line, Shun moves through memories of the Demon War. He was fifteen at his first battlefield, marching with armoured demonfolk out of the forests of Eterna. He remembers the first friend he ever made — a taller demon with grey horns and blonde hair going to grey — and then kneeling over that friend's body, burned beyond recognition by human war magic. He remembers killing a human survivor who was praying for mercy.

The price

Mimi understands from the moment she is summoned that the intervention will be paid for. Shun understands it too. At the height of the victory, while both armies are cheering, he is taken by a vision of Magnus enthroned, radiating disappointment rather than anger, and raising a hand in a gesture Shun recognises immediately as the prelude to suffering. Shun stands silent in the middle of the celebration and takes one steadying breath, described as a surrender to a fate he can no longer avoid. What that fate is remains undisclosed at this boundary.

The letter and the ball

A week after the battle, Zero finds Shun lying in his hammock in the clearing behind the Tower, staring at the dusk and, in the butler's words, wallowing in self-pity. Zero has accepted a sealed invitation from Queen Satomi Hikari at the forest boundary and tosses it into the hammock.

Shun is angry that it was accepted at all. Zero disarms him by quoting him back to himself: Shun once told his butler that abandoning the woman he loved was a mistake he had regretted every day since, and Zero asks what kind of butler he would be if he let his master repeat it. Shun takes the letter and gets up.

Before he leaves, he says quietly to the forest air that they will come for him. Zero answers that he will be at the gates to receive them. Shun offers no reply and returns to the Tower to prepare for the storm.

The watchdog and the butterfly

At the victory ball in Goguma, Shun stands apart with a wine glass he never drinks from, watching Yumi Raijin across the hall. He studies her deliberately — her movements, her powder-blue dress, her smile — to fix a permanent image of her in his mind, an illustration that even death could not rob him of. He thinks she resembles a blue butterfly fluttering over an ocean, and laughs quietly at how plainly unaccustomed she is to court society.

The court's reaction to him is the counterweight. Nobles gather into tight defensive knots and speak from behind gloved hands and ivory fans, loudly enough to be felt: *why is that THING here*, *did you hear what he did to the usurper*, *the other nations will not stand for this*, *his very presence is an insult*. Shun records that he is used to it — he is an intruder and a stain on everyone's evening.

Watching Yumi surrounded by suitors from Kaladria's finest houses while he stands on the sidelines, he concludes that coming was a mistake, sets down his glass, and turns for the exit.

Yumi calls his name before he reaches it, and asks him to dance. He weighs it as a tactical problem — how the court will view her, whether his shadow will stain her light after she sacrificed everything to keep it burning — and finds every path leading to ruin. A second, quieter “S-Shun…?” settles him. He decides that if these are his final moments with her he will cherish them, and takes her hand.

He leads her to the centre of the hall, sets a hand at her waist as an anchor against a thousand judging eyes, and dances. The narration treats each sweep as a defiant statement, the dance carving out a territory where the two of them alone rule — a sanctuary where, in its own phrase, the watchdog and his butterfly may rest their endless worries. He teases her about preferring her in armour, and spins her to watch her blush.

Refusal and confession

When Yumi asks him to stay, Shun refuses, and gives his reasons in full for the first time in the published story. He is neither guest nor citizen but a fuse — a weapon of destruction. Magnus will use him as an excuse to reignite the war, will burn down the world to ashes to find him, and will stop at nothing; his stubbornness, Shun says, is without equal. When Yumi answers that they will face him together, Shun tells her he cannot be the reason she and her people die.

Asked then why he fought for them, why he protected her, why he took her hand, he says: “Because I love you.” It is the first time he states it aloud. When Yumi begins to answer in kind he cuts her off sharply — “Don't say it… Don't give me hope” — and the sight of her tears breaks him, because they are the exact consequence he had tried to avoid. He believes the refusal is nonetheless for the best.

The moment is ended by Zero's telepathic voice reaching him mid-dance. Shun's manner shifts instantly back into the cold, calculating Lord as he asks what has happened, and is told that the Cavalry has arrived.

“Live, Yumi”

Shun ends the dance himself. As the orchestra stops he wipes the tear from Yumi Raijin's face, gives her one last gentle smile, and sends her into a final sweeping twirl; at the apex of the spin their fingers part, and his shadows rise like a tide around him. His last words to her are “Live, Yumi,” and then “Live long, and prosper.” She reaches for him and he is gone, taken by his shadows from the middle of the Great Hall.

The farewell to Mimi

His shadows return him to his study at the Tower, where Mimi Sato is waiting with tea already served and greets him with “Welcome home, Father!” She sees through his smile at once. He calls her to him, pats her head, cups her cheek, and holds her against his chest while he tells her, “I'm sorry, kiddo.”

Then he speaks one more name — “Ryosuke” — and Ryosuke rises from his shadow and knocks Mimi unconscious with the pommel of his sword. Shun catches her and holds her, fighting back tears; the narration states that he was saving her, and in doing so breaking her heart. He orders Ryosuke to take her to her room and return to his post, his voice trembling.

Surrender at the portal

Shun's shadows carry him next to the cold stone chamber beneath the Tower, before the green portal the narration says he once studied with diligent curiosity. Zero is waiting with him when Akiyama Magnus brings his knights through.

Akiyama greets him as an old acquaintance — “It's been a while, Shun” — and explains that the nobles sent him because Shun would never harm him. Their exchange turns bitter quickly: Shun mocks the nobles for having grown smarter, Akiyama answers that isolation must have clawed at Shun's own intelligence, and demands to know what he was thinking. Shun replies that whatever words he has are for Magnus's ears only, and that Akiyama will not hear him beg or bargain.

He then extends both wrists for the manacles. The narration reads his defiance as still alive in his jaw and eyes, but calmed by a fate he has already surrendered to — a man, as Akiyama sees him, who has given up on hope. When a knight snaps the irons shut and whispers that this was always the fate of an “abominable half-ling,” Shun says nothing; the man is beneath his notice. Akiyama knocks the knight senseless and names Shun to his men as the former Royal Knight of the Demon King, the Hero of the Demon War, and the Lord of the Tower.

The last orders

Before he goes, Shun transforms in front of the knights — eyes igniting crimson, horns and tail emerging — and his mana changes so violently that the guards recoil. He summons Roku from his shadow and orders him to guard the gate and let no one through, humans and demons alike; if Shun has not returned within a week, Roku is to take Mimi as far away as he can and care for her as if she were Shun himself.

He orders Zero to take the rest outside and guide them home safely. Zero refuses, and when Shun demands to know why he must be so stubborn even at the edge of the grave, Zero answers: “Because She is never wrong.” The words silence Shun completely. He concedes — “Fine, suit yourself!” — and turns back to Akiyama.

Asked who all these people are and what he has become, Shun answers: “The monster you all judged me to be!” Akiyama sheathes his sword and orders the fallen lord taken to the dungeons.

The walk through the Frontier

The portal's far side opens onto the Frontier, the capital of the Demon Continent, and Shun is marched in chains down its straight main road toward the Demon Castle, six knights ahead of him and six behind. He looks back for a final glimpse of the home he built and the servants who had become his only family.

The city stops to watch, and its whispers range from grief to open hatred. Shun does not respond. The narration attributes his restraint to years of mistreatment and discrimination that taught him the lesson from childhood — that wherever he went and whatever he did, he would always be feared and always be hated.

The cell and the dream

Shun is locked in a solitary cell at the edge of the castle dungeons, behind a steel gate with only a slot for food, to await the day he stands before Magnus. He sits in a corner and falls into a deep sleep.

He dreams first of a cyan-haired woman playing a flute beneath the shade of a tree, in a garden in bloom. The dream then shifts to a human woman with short dark brown hair and hazelnut eyes, lying ill in a plain wooden bed — tired, trembling and coughing, but looking at him with unconditional love, touching his cheek and patting his head. She sings him a song whose refrain is “Live on,” with the lines “It is the law of life, after all” and “Choose, oh my dear, whether to be / Strong or Frail, for a future we shall see.” Its words are ones the narration says he would forever live by. In the dream Shun finally understands where he had heard the tune Yumi Raijin played before, and why it sounded different yet so familiar: it is the same melody.

The bed then empties and the room goes dark, leaving a tall, slender old man standing over him — gaunt, reeking of cheap alcohol, with long crimson hair, an unkempt beard, beggar's rags, and a distinct blue brooch on his chest whose meaning Shun does not know. The man shouts soundlessly, with lip movements Shun finds harrowingly familiar, and throws a right hook that jolts him awake. The chapter does not name either figure.

Imprisonment

In the darkness of the cell Shun cannot tell whether he has slept for an hour or a year. His food is stale, mouldy bread and water in a broken glass, served, the narration states, to degrade him. He eats it without complaint; the sour taste is one he knew well and had forgotten, and he calls it nostalgic. Afterward he meditates in his corner, holding on to memories of his youth — of love, war and friendship — to keep his sanity.