Katsuyamagumi: The Shadow Demon's Empire
Katsuyamagumi (勝山組) is a Yakuza organization founded in 2020. Founded by Katsuyama Junichi along with thirteen disciples to attack the notorious Yoshiyamakai syndicate in the Kansai region due to personal grudges, Katsuyamagumi completely exterminated every member of Yoshiyamakai and their subordinate organizations, leaving no survivors and devastating them utterly.
Afterward, they seized and operated the assassination contracts and business entities run by Yoshiyamakai, further expanding their power. In 2024, they toppled Yamazaki-gumi, which had been causing terror in the Kanto region. After dominating most of Japan's underworld, Katsuyamagumi amassed enormous profits through a variety of crimes, including assassination contracts, drug and weapon smuggling, organ trafficking, illegal gambling halls, illegal cryptocurrency operations, and voice phishing schemes.
Using Shirotsuki Holdings, the company operated by division leader Ooyama Haruto, they laundered the criminal funds and bribed high-ranking Japanese officials, rapidly increasing their influence in Japan. Their reputation in the Japanese underworld is one of fear, due to their ruthlessness in slaughtering the families of those who oppose them and their deep ties with the power structure. Small and medium-sized Yakuza and Han-gure avoid conflict with them at all costs.
This massive organization extends its influence across Japan, South Korea, China, Southeast Asia, Central and South America, Western Europe, and even the underworld in Africa. Incidentally, among the current Oyabun of Katsuyamagumi, some disciples who received training not directly from the Oyabun Junichi but from the 1st Division Leader Sakaguchi Taiki or the 2nd Division Leader Kanemura Yoshio. This is because some of Junichi's original disciples were killed in battles against rival organizations.
The organization's members, based on 2027, are as follows. Katsuyama Junichi is the Oyabun of Katsuyamagumi and is also known as the Shadow Demon, Japan's top assassin. He received training in assassination techniques from a master assassin and is proficient in unarmed combat, knife work, kendo, firearms, and even sniping. Although he was not born with a monstrous nature, his past life of hardship led him down the path of murder, twisting his personality. Nevertheless, he cherishes those around him, particularly Yukiko (Hakuro), and would exterminate any organization that dares to harm him.
Age: 45 years old. Height: 185 cm. Weight: 85 kg. Blood type: A. Specialty: Unarmed combat, assassination, firearms.
Hakuro is Junichi's actual first disciple. His true identity, age, height, gender, hometown, and everything else remain shrouded in mystery. While Junichi hides his identity, even the Metropolitan Police, who can discern his identity in an instant if they set their mind to it, have no information on him. However, information about his presence in Korea spread throughout Katsuyamagumi after Haneda Shinichi returned from Korea, and despite his location being exposed, he chose not to leave Korea and instead confront Katsuyamagumi. There are mentions of him betraying the organization and causing significant losses, which is why Sakaguchi Taiki and other members of Katsuyamagumi want him dead. However, since Junichi treats him like a son, they cannot kill him lightly.
Age: Unknown. Height: Unknown cm. Weight: Unknown kg. Blood type: Unknown. Specialty: Dog fighting, assassination, firearms.
Sakaguchi Taiki is Junichi's official first disciple and the 1st Division Leader of Katsuyamagumi. He does not view Hakuro favorably because of the losses caused by his betrayal and wants him dead, yet he cannot act rashly because of Junichi's special affection for him. Sakaguchi Taiki has fully mastered all of Junichi's assassination techniques alongside Hakuro and Kanemura Yoshio, giving him a reputation for combat prowess not only in Japan's underworld but across East Asia as well. As 1st Division Leader, he receives Junichi's full trust and holds significant power within the organization, yet he feels jealousy toward Junichi for treating Hakuro more specially than him. He has sparred with Hakuro countless times while receiving Junichi's teachings and has known his identity for a long time, but he has refrained from telling other executives because of the fear of Junichi's wrath.
Age: 36 years old. Height: 187 cm. Weight: 88 kg. Blood type: AB. Specialty: Unarmed combat, assassination, firearms.
Kanemura Yoshio is the 2nd Division Leader of Katsuyamagumi. He became Junichi's disciple after Sakaguchi Taiki. His only family, his younger sister Yoshiko, was kidnapped by Han-gure, and he infiltrated their hideout alone to rescue her. He nearly died in the process, but Junichi and Hakuro intervened, and Hakuro took the Han-gure hostage to save her. In gratitude, Kanemura Yoshio rescued Hakuro at Yoshiko's request, and he has never forgotten the debt. His bond with Hakuro is deep, and he is one of the few who knows Junichi's and Sakaguchi Taiki's identities as well.
Age: 33 years old. Height: 184 cm. Weight: 82 kg. Blood type: A. Specialty: Kudo, Aikido, firearms.
Haneda Shinichi is the 3rd Division Leader of Katsuyamagumi. A former special operations soldier from the Japan Ground Self-Defense Force, he was dishonorably discharged after a severe incident and began taking assassination contracts while wandering the underworld. One day he attempted to assassinate Junichi but failed, and Junichi recognized his skill, sparing his life. Haneda Shinichi tried to kill Junichi again afterward, but Junichi continued to spare him, and even saved him from death at the hands of other Yakuza with Hakuro's help. After that, he became Junichi's subordinate and disciple, joining Katsuyamagumi.
Age: 35 years old. Height: 187 cm. Weight: 85 kg. Blood type: O. Specialty: Dog fighting, CQB, sniping.
Kojima Ryunosuke is the 4th Division Leader of Katsuyamagumi. A native of Osaka, he speaks the Kansai dialect. The betrayal by Hakuro cost him numerous business entities and subordinates, fueling his deep resentment toward him.
Age: 29 years old. Height: 176 cm. Weight: 73 kg. Blood type: B. Specialty: Kendo, firearms, torture.
Hashimoto Ryuhei is the 5th Division Leader of Katsuyamagumi. He was a close friend of the former 6th Division Leader Honda Hideki, and the two entered the organization together. He learned various fighting styles and firearms techniques from Sakaguchi Taiki, Junichi's disciple.
Age: 30 years old. Height: 183 cm. Weight: 83 kg. Blood type: A. Specialty: Kali Arnis, karate, driving.
Kuroba Itzuki is the current 6th Division Leader of Katsuyamagumi. Originally under Haneda Shinichi, he became the new 6th Division Leader after the previous one, Honda Hideki, died. He is recognized as having outstanding skill within Katsuyamagumi and, like Haneda Shinichi, is a former special operations soldier from the Japan Ground Self-Defense Force.
Age: 29 years old. Height: 179 cm. Weight: 81 kg. Blood type: O. Specialty: CQB, Krav Maga, Aikido.
Tomio Ka Hideo is a subordinate of Sakaguchi Taiki. In reality, he is an undercover agent dispatched by the National Police Agency's Public Security Bureau. He has some relationship with Hakuro; his close friends and colleagues were sacrificed because of Hakuro, yet for some reason he does not blame him and even warns about Sakaguchi Taiki coming to Korea.
Age: 32 years old. Height: 178 cm. Weight: 77 kg. Blood type: O. Specialty: Aikido, baton, firearms.
Ooyama Haruto handles the finances of Katsuyamagumi and operates the company Shirotsuki Holdings on the Japanese mainland. Through Shirotsuki Holdings, he launders the criminal funds earned by Katsuyamagumi and either bribes high-ranking Japanese officials or hides the funds in Katsuyamagumi's secret vaults.
Age: 48 years old. Height: 177 cm. Weight: 75 kg. Blood type: A. Specialty: Business expansion, financial management, money laundering.
Honda Hideki was the former 6th Division Leader and a close friend of the 5th Division Leader Hashimoto Ryuhei. In 2026, while on a trip to Busan, South Korea with Haneda Shinichi and Hashimoto Ryuhei for business with Gangryonghoe and engaging in nightlife, he was killed in an attack by a black agent from the National Intelligence Service.
Age: 29 years old at death. Height: 179 cm. Weight: 80 kg. Blood type: O. Specialty: Street fighting, firearms, gambling.
Sakura Kanoko is the 7th Division Leader of Katsuyamagumi. In the 155th episode, along with other division leaders, she attempted to kill Hakuro but failed when mysterious intruders suddenly appeared. Later, in the 203rd episode, while fleeing from Hakuro's allies, she was captured.
Age: 30 years old. Height: 165 cm. Weight: 50 kg. Blood type: A. Specialty: Assassination, driving, karate.
Sasaki Sojiro is the 8th Division Leader of Katsuyamagumi. In the 135th episode, along with subordinates, he pursued and attempted to kill Hakuro. When Hakuro entered a construction site, instead of waiting for the 5th Division Leader Ryuhei, he entered the building with two other subordinates to kill Hakuro.
Age: 30 years old. Height: 180 cm. Weight: 78 kg. Blood type: A. Specialty: Driving, Aikido, mahjong.
Nishijima Takeshi has been by Junichi's side since the organization was founded. He aided Junichi because of his grudge against Yoshiyam Hirosh. His deep grudge against Yoshiyam Hirosh led him to actively participate in the massacre of Yoshiyamakai members when Junichi attacked.
Age: 33 years old. Height: 187 cm. Weight: 93 kg. Blood type: AB. Specialty: Jiu-jitsu, Kali Arnis, torture.
Aoki Genji is the 10th Division Leader of Katsuyamagumi. Originally a Yakuza from a small organization who nearly died after causing losses, he was saved by Hakuro when he invaded the organization. Afterward, he joined Junichi with Hakuro and learned assassination techniques in earnest, eventually becoming the 10th Division Leader. Incidentally, he is also the boyfriend of Kanemura Yoshio's younger sister, Kanemura Yoshiko.
Age: 28 years old. Height: 178 cm. Weight: 78 kg. Blood type: A. Specialty: Kendo, Aikido, Kali Arnis.
Shimada Takuya has been by Junichi's side since the organization was founded.
Age: 33 years old. Height: 182 cm. Weight: 87 kg. Blood type: O. Specialty: Judo, sambo, firearms.
Sato Tetsuya has been by Junichi's side since the organization was founded.
Age: 32 years old. Height: 185 cm. Weight: 90 kg. Blood type: A. Specialty: Dog fighting, firearms, driving.
Aoki Hanzo is the older brother of Aoki Genji and a killer currently cooperating with Katsuyamagumi and operating internationally. Originally a killer active across Asia before cooperating with Katsuyamagumi, he feels gratitude toward Hakuro for saving his brother from death at the hands of Yakuza. After receiving help from Hakuro, he was approached by Junichi to cooperate with Katsuyamagumi, and he became a freelancer killer with a relationship indistinguishable from being a full member.
Age: 30 years old. Height: 180 cm. Weight: 79 kg. Blood type: B. Specialty: Kudo, combat sambo, firearms.
Kanemura Yoshiko is the younger sister of 2nd Division Leader Kanemura Yoshio and the lover of 10th Division Leader Aoki Genji. After being saved by Hakuro, she learned self-defense from him and has become one of the most friendly toward Hakuro.
Age: 28 years old. Height: 168 cm. Weight: 50 kg. Blood type: A. Specialty: Kali Arnis, parkour, driving.
In early July 2027, new members were recruited as the organization's power had decreased due to previous battles. These are high-ranking executives newly scouted by Junichi and Taiki within their business areas.
Antonio Moretti was a Mafia executive from Sicily, Italy. After clashing with the organization boss over his clothing and killing his boss's younger brother in front of him in a cruel manner, he was expelled from the organization. Generally calm, he hates stress and will pick fights over small things; if someone stresses him, he will kill without hesitation regardless of method.
Age: 36 years old. Height: 189 cm. Weight: 86 kg. Blood type: AB. Specialty: MMA, firearms, assassination.
Jiang Weiyong is a hitman from Hong Kong's 21st Century Triad. He was scouted by Taiki during his business in Hong Kong. Strong in combat, especially information warfare, he is skilled at dirty tactics such as provoking opponents into complacency using gathered intelligence.
Age: 35 years old. Height: 189 cm. Weight: 84 kg. Blood type: O. Specialty: Hapkido, firearms, information collection.
Im Do-jun is a Japanese-Korean with the Japanese name Haruda Kazuki. A former action commander of the small Yakuza Kuroki-kai active in Osaka, he was scouted by Taiki and Ryuunosuke during their business in Osaka. Generally calm despite his tattooed and scarred appearance, he has a split personality that makes him go berserk at the sight of blood, beating opponents to death with knuckles or tearing them apart with a knife while laughing.
Age: 28 years old. Height: 190 cm. Weight: 90 kg. Blood type: O. Specialty: Dog fighting, baton, parkour.
Carlos Vasquez is a hitman from Mexico's drug cartel. Scouted by Junichi after he attacked the cartel during business negotiations; Junichi was impressed by his strength and offered him a position. Hostile and enjoys combat, as expected from a Mexican drug cartel member. He uses a fully automatic modified Glock 17 with a carbine kit as his main weapon.
Age: 29 years old. Height: 181 cm. Weight: 78 kg. Blood type: B. Specialty: Street fighting, firearms, driving.
Amamiya Ren is a mercenary from PMC Double Rapier, active mainly in the Middle East and Southwest Asia. A wandering mercenary in the Middle East, he clashed with Taiki and others in Qinghai, China over business with the black society. Impressed by his skill, Taiki offered him a position, and he joined Katsuyamagumi.
Age: 29 years old. Height: 175 cm. Weight: 72 kg. Blood type: A. Specialty: Krav Maga, firearms, drone piloting.
Comba Diallo was a high-ranking officer in Sierra Leone's rebel army from boy soldier days and became a mercenary in Sierra Leone and other African countries due to the organization's mercenary business. He learned Nigerian martial art Dambe and uses it. A blunt and cruel personality, he was scouted by Junichi during his arms smuggling business with African criminal organizations.
Age: 33 years old. Height: 196 cm. Weight: 98 kg. Blood type: A. Specialty: Dambe, pencak silat, firearms.
--- Spoiler Warning ---
Hakuro's identity and actions are detailed in the profile of Yamada Yukiko.
Kuroba Itzuki's true identity is an undercover agent from the National Police Agency's Public Security Bureau. In the 136th episode, he came to the building where Hakuro was to help him and confirmed the deaths of Ryuhei's subordinates. Afterward, he informed Hakuro of information regarding the drug trade between Katsuyamagumi and Choi Gyeong-su.