Kiseki-o

Kiseki-o 「鬼箱王, ???」 is a high ranked demon of the Black Demon Series. It formed a contract with Shihō Kimizuki, and became his Demon Weapon.

Appearance
Kiseki-o appears as an androgenous preteen. He has red eyes, pointed ears, fangs, black horns as long as his forearm (after he drinks Shiho's blood), and a fluffy tail as long as he is tall.

He has short yellow-green hair with short bangs and short eyebrows. He wears a black headband behind his horns. He wears dangling earrings with sapphire orbs. He wears a white sleeveless collared shirt with a black knot. He has a brown belt, and he wears short black shorts.

He wears black cuffs on his forearms, and he has black socks that reach up to a few inches below his knees. He wears black boots with heels that he leaves unzipped halfway.

He often takes the image of Mirai Kimizuki while battling Shiho for control.

Personality
As a possession-type demon, he is particularly proud and nasty, and he is utterly unwilling to surrender to the weak. He uses the memories of Shiho's sister, Mirai Kimizuki, against him to break his will.

Unlike Yuichiro Hyakuya and Asuramaru, Shiho must assert his dominance through violence.

Mind you, he acts this way despite the fact he claims to like Shiho.

History
Kiseki-o is a demon who was sealed within Cursed Gear connected twin swords

Second Shibuya High Arc
Although Kiseki-o does not actually appear, Shiho Kimizuki forges a contract with him in chapter 6 and does so faster than Yuichiro and Asuramaru.

Post-Shinjuku Arc
Shiho advances his training with Kiseki-o, and they battle for over 30 hours. Shiho screams and shakes as they fight within his mind. Shinoa warns her squad to be prepared to eliminate Shiho if he loses control.

In Shiho's mind, he struggles against Kiseki-o, who taunts and then stabs him, catching Shiho's blood in his mouth. He insists that Shiho's body is already his and bites him, commanding him to break and sending him into his illusion.

Shiho relieves his past of four years ago when he was eleven years old. Haruka says to leave her behind, and Shiho realizes this is an illusion once again. Kiseki-o corrects him, saying that these are his true memories and insisting that he wanted to abandon his sister.

Three other kids around Kimizuki's age come to his apartment door and say its time to move. They try to convince him to kill Mirai, who is an invalid and is always holding them back. They say she told him she wanted this. When he refuses to, they say they will do it for him. He breaks free and locks them outside of the apartment. Mirai insists on Shiho killing her, and Shiho keeps telling her to shut up. The demon reveals his deepest desires, insisting he resents taking care of Mirai and wondering why this all happened to him.

Shiho approaches Mirai and begins chatting about Yu. He says Yu wants to rescue his family no matter what, even though they aren't blood related. Shiho says that if the only solution is to kill his sister, then he will choose death. He insists he will never do what the demon says and stabs himself to break free.

Recovered from the psychic wounds, he charges at Kiseki-o and cuts him. Kiseki-o says there is still darkness in Shiho enough to betray his friends if it meant saving his sister. Shiho insists there is no one without darkness in this world, and Kiseki-o smiles. He says he likes humans and Shiho and decides to lend Shiho his power.

Forms and Abilities

 * Demon's Thrall: Kiseki-o can enter his host's dreams and memories to create nightmares and break his host's will. This is done in order to take over his body.  This ability can only be used against his host.
 * Basic Form: Connected twin swords are Kiseki-o's most basic form. He gives his bearer great strength and power.  By calling his name, he gives his bearer even greater power.  A melee-type weapon.
 * The Devil's Coffin: Kiseki-o's special ability involves manifesting and opening the devil's coffin on the count of nine. The effects are currently unknown, but Yu gets very bad vibes from it and claims it's something really nasty. This type of ability should be impossible for a possession-type demon.

Trivia

 * His name literally means "King of the Demon Box."

Quotes

 * "La la. La de dah de dah.  Well now, Shiho Kimizuki.  Would you like to give up?"--Kiseki-o to Shiho Kimizuki, Chapter 21, "Kiseki'o's Box"
 * "I do not submit to the weak."--Kiseki-o to Shiho Kimizuki, Chapter 21, "Kiseki'o's Box"
 * "This is the end, Human. Relive your past.  See your inner darkness.  Look at your deepest, ugliest desires.  Let 'Shiho Kimizuki' break."--Kiseki-o to Shiho Kimizuki, Chapter 21, "Kiseki'o's Box"
 * "There, see? For a moment, you wished you could end it all.  You were sick of it.  You wondered why all this had to happen to you.  You were only a child, after all.  It was hard.  You were scared.  You wanted someone to save you.  You wanted to run away from it all, forever.  If only you had actually killed your sister...  If only you had rid yourself of that burden...  Wouldn't it have been better?  Yes...  That's exactly what you thought, isn't it?  It is over, SHiho Kimizuki.  You failed at life that day, when you made the decision you did.  There's no need to be stubborn.  Take the easy path.  It's simple.  Just take that knife and do what you should have done then.  Come on.  Put your sister out of her misery."--Kiseki-o to Shiho Kimizuki, Chapter 21, "Kiseki'o's Box"
 * "...Ah well. There is no rush.  After all, there is still darkness inside of you.  Darkness so deep you wouldn't hesitate to betray your friends if it meant saving your sister."--Kiseki-o to Shiho Kimizuki, Chapter 21, "Kiseki'o's Box"
 * "Yes... That's right.  That's why I like humans.  And I like you too.  I guess I could lend you my power.  You are ugly, young and naive... but you may call upon me to possess you."--Kiseki-o to Shiho Kimizuki, Chapter 21, "Kiseki'o's Box"