Kazuki Karaiya
- Primary work
- Crazy Diamond's Demonic Heartbreak
Other recorded work links
Kazuki Karaiya (仮頼谷 一樹, Karaiya Kazuki), also known as the Ultimate Singer (アルティメット・シィンガー, Arutimetto Shīngā), is the main antagonist of the spin-off manga Crazy Diamond's Demonic Heartbreak and the light novel Crazy Heartbreakers.
He is a police officer in Morioh and a Stand user, sharing control of the parrot Pet Sounds 's Stand. He also temporarily wields Boingo 's Tohth.

Image attribution details
Kazuki Karaiya. Source illustration via JoJoWiki; copyright remains with the original rights holders.
Image via JoJoWiki. Original franchise/production rights holders retain copyright; the wiki text CC BY-SA license does not license this image.
Original image ↗ · Archived image ↗01Basic information
02Appearance
Karaiya is a tall man with an androgynous appearance. He has light-colored hair styled in a bob cut, a mole below his right eye, and flat eyebrows. He wears a typical Japanese police officer uniform in the springtime consisting of a hat with an emblem on the front alongside a coat with a white dress shirt and a dark tie underneath.↗
03Personality
Karaiya normally presents himself as calm and serious, but beneath that facade lies a hidden darkness and contempt. Ultimately, he is deranged, sadistic, and an elitist. He manipulates Pet Sounds's Stand to attack innocent civilians, including Josuke Higashikata, the grandson of Karaiya's coworker, Ryohei. He goes as far as attempting to murder Josuke, planning to make it look like a suicide. Karaiya allows criminals like Koji Kiyohara to roam free if it means they can be of assistance to his plans, permitting the man to shoot a kindergartner and others with a crossbow.↗↗↗↗↗
Karaiya's primary motivation comes from being the only member of his family to carry the remnants of his grandfather Mogizo Karaiya 's ideology, which the latter learned from Kars. They believe the winner should focus on being the one who comes out on top. Despite not being athletic and having average or slightly below average grades in school, Karaiya believes that he is the greatest in the world and that everyone else is beneath him. He has a superiority complex, perceiving other people around him as ignorant imbeciles.↗↗↗
04Abilities
Pet Sounds
After sharing a piece of his earlobe with Pet Sounds, Karaiya's soul mysteriously connects with Pet Sounds, allowing them to share the same Stand. Karaiya is capable of fully wielding it for his own gain. Pet Sounds's Stand is capable of recording events from the past in punched cards and inserting them into someone's body. The victim's body is then forced to reenact the event, essentially parroting what happened.↗
Tohth
Tohth is a comic-book-like Stand whose whimsical story periodically updates itself to predict the close future with 100% accuracy. After incapacitating Ryoko and Boingo, Karaiya takes the book for himself.↗
05Story
SPOILERS
Background
When Karaiya was young, his grandfather Mogizo Karaiya advised him not to open his heart to humans because of how shallow they are. Before World War II, Mogizo was at St. Moritz, Switzerland for an intelligence operation, where he experienced something that transcended all of creation. Mogizo never shared the truth with his son since he was already born by the time Mogizo became a vampire, but he decided to tell his grandson since he felt that both of them were similar.↗↗↗
After growing older, Karaiya started working in Morioh as a police officer in the Budogaoka Police Station. In March 1999, Keicho Nijimura stole Pet Sounds in Cairo, Egypt, and brought the parrot with him to Morioh. At some point, Karaiya retrieves the parrot from Keicho; Hol Horse assumes that he confiscated the bird. Karaiya shares a piece of his body with Pet Sounds, linking their souls together and making them share the same Stand.↗↗↗↗
Attacking Hol Horse
Karaiya first controls Pet Sounds to use its Stand on the police inspector, Hiraoka. While driving to work, Hiraoka runs over several pedestrians and nearly crashes into Hol Horse.↗↗
At the Budogaoka Police Station, Karaiya takes interest when Boingo mentions that he lost a manga. Ryohei asks Karaiya to escort Boingo back to his hotel. Before they leave, Karaiya ominously hopes that Ryohei could get a promotion someday for his hard work and passion.↗↗
Later, Karaiya has Pet Sounds use its ability to possess a group of chefs. Watching from an alley, Karaiya witnesses Hol Horse using his Stand to defend himself and is excited to learn that there are other Stand users in Morioh.↗↗
Manipulating Kiyohara
Without directly meeting him, Karaiya gives Koji Kiyohara permission to kill whoever he wants, while also having Pet Sounds attack Josuke and Hol Horse. However, Kiyohara and Pet Sounds are both defeated by the duo, allowing Ryohei to arrest Kiyohara. While Kiyohara is in his jail cell, he sees a memory of Karaiya sitting beside him in a police car. Karaiya asks him how it felt to lose. When Kiyohara doesn't answer the question but instead asks who Karaiya is, Karaiya screams at him.↗↗↗
Retrieving Tohth
Karaiya looks at the civilians around him and feels that he is superior to all of them. Recalling his grandfather 's words from when he was younger, Karaiya has full faith that he can crush anyone that stands in his way. Karaiya walks up to Boingo, who is taking shelter from the rain, and asks if he needs a hand searching for his book. However, Karaiya actually incapacitates Boingo and carries him with one arm while looking for Tohth.↗↗
Final Battle
Karaiya then uses Boingo as bait to lure Josuke into a trap. Despite Josuke's caution, he falls for it and Pet Sounds is able to attack him. Josuke and Boingo manage to break free from the illusion thanks to Josuke's Stand, causing Karaiya to grind his teeth in anger wondering what kind of ability Josuke has. He assures that no matter what tricks Josuke uses next, he will never win against the abundant memories Pet Sounds has stocked up.↗↗↗
Karaiya attempts to have Josuke hear The World 's Stand cry, which he claims is the most powerful sound. Pet Sounds plays the sound with its Stand and Karaiya boasts about taking his place far above humans and looking down on everyone. Fortunately, Josuke is unharmed and only complains about his ears ringing. He had previously broken Pet Sounds's beak when he punched the parrot earlier to escape the D'Arby illusion.↗↗
Ryohei and the other officers eventually recover a handgun at the construction site, and also find Karaiya strung up on a nearby tree. Karaiya had taken the gun without permission from a colleague. The upper management of the police force struggle with the decision of whether to treat him as retiring due to mental illness or to dismiss him for violating the code of conduct. They aren't able to interrogate him as he is mentally unfit to answer any of their questions.↗↗↗
06Plot details
SPOILERS
Profile details
Status Status based on their final appearance in the part(s) they are featured in: Retired (CDDH)↗
07Relationships
| Character | Relationship | Notes |
|---|---|---|
| Mogizo Karaiya | Grandfather | ↗ |
08Sources & attribution
- Kazuki Karaiya
Source bibliography (13)
- Crazy Heartbreakers Chapter 7: DIO Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 3 Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 14 Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 8 Open ↗
- Crazy Heartbreakers Chapter 4: Descent on Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 9 Open ↗
- Crazy Diamond's Demonic Heartbreak: Final Chapter Open ↗
- Crazy Heartbreakers Chapter 8: Diamond Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 11 Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 1 Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 4 Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 7 Open ↗
- Crazy Diamond's Demonic Heartbreak: Chapter 10 Open ↗
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