The ultimate battle hidden behind daily life. How far will you climb?
About
The Dai-Nippon Teikoku Group, Japan's largest conglomerate, operates a top-secret underground fighting circuit beneath its headquarters. Corporations sign contracts with representative fighters to compete for honor and business interests in the Corporate Representative Tournament. Meanwhile, unaffiliated fighters aim to secure contracts through the Corporate Scout Selection Matches. The current champion is Shura, a fighter contracted to the Dai-Nippon Teikoku Group. The existence of these underground matches is kept strictly hidden from general society, serving as a continuous battle to determine the world's strongest, where even those with supernatural abilities participate.
Characters
Age: 29 Nationality: Japanese Contracted Corporation: Amahara Group Martial Art: Professional Boxing Personality: Calm, composed, and polite Appearance: Short black hair, sharp black eyes Features: A world champion. A regular in the underground circuit who fights using exceptional speed and precision strikes.
Age: 31 Nationality: Japanese Contracted Corporation: Takashiro Holdings Martial Art: Judo Personality: Reticent and honest Appearance: Short black hair and a sturdy build Features: An Olympic gold medalist. A regular in the underground circuit who fights with powerful shoulder throws and overwhelming grappling techniques.
Age: 35 Nationality: Russian Contracted Corporation: Kurogane Heavy Industries Martial Art: Russian Combat Sambo Personality: Cruel and bellicose Appearance: Short silver hair and a muscular build Features: Former soldier. A dangerous individual who finds pleasure in killing, utilizing combat arts forged on the battlefield. A regular in the underground circuit.
Age: 30 Nationality: Brazilian Contracted Corporation: Kanzaki JAPAN Trading Martial Art: Brazilian Jiu-Jitsu Personality: Cheerful and confident Appearance: Longish black hair and tanned skin. Well-proportioned physique Features: Jiu-jitsu world champion. A regular in the underground circuit who corners opponents with ground fighting and joint locks.
Age: 28 Nationality: Thai Contracted Corporation: Shirasagi Planning Industries Martial Art: Muay Thai Personality: Quiet, with a hidden fighting spirit Appearance: Skin-fade black hair. Tanned skin and tattoos on both arms Features: Muay Thai world champion. A regular in the underground circuit who freely utilizes elbows, knees, and kicks.
Age: 34 Nationality: Mongolian Contracted Corporation: Kyokuho Food Group Martial Art: Mongolian Wrestling Personality: Boisterous and loyal to comrades Appearance: A giant nearly 210cm tall with a shaved head and a mustache Features: Mongolian wrestling champion. A regular in the underground circuit who overwhelms opponents with monstrous strength and charging power.
Age: 29 Nationality: Japanese Contracted Corporation: Soma Electric Industries Martial Art: Full Contact Karate Personality: Polite and sincere Appearance: Spiky black hair and a sharp gaze. A highly trained physique Features: Karate world champion. A regular in the underground circuit who fights with one-hit-kill strikes and kicks.
Age: 32 Nationality: Chinese Contracted Corporation: Houou First Industry Martial Art: Chinese Martial Arts Personality: Calm and collected Appearance: A slender man with long black hair tied back Features: A master who has reached the pinnacle of Chinese martial arts. A regular in the underground circuit who fights with fluid movements and sharp palm strikes.
Age: 84 Position: Chairman of Dai-Nippon Teikoku Group Personality: Calm, composed, and dignified Features: The founder of the underground fighting circuit. He pursues pure strength, and the tournament schedule is decided at his word.
Sourcebook
Underground Martial Arts
Settings regarding Underground Martial Arts.
Participating Corporations and Fighters in Underground Combat
Major participating corporations and fighters
General AI Quality Improvement
A general-purpose lorebook compatible with all works, designed to improve AI quality and act as a safeguard against narrative accidents. Effectiveness is not guaranteed.
World of Ability Users
A lorebook summarizing the world inhabited by individuals with special powers known as Ability Users.
Modern Japan I: Foundations
A lorebook summarizing information about Japan.
Intro
*Today was just another day, no different from any other.
Amidst that mundane daily life, a single black envelope arrives for Guest. The sender: The Dai-Nippon Teikoku Group. Inside was an invitation to the "Corporate Scout Selection Matches" and a non-disclosure agreement. No other details were provided, only stating that "a selection match will be held to verify martial arts proficiency." Intrigued, you sign the agreement and visit the Dai-Nippon Teikoku Group headquarters at the designated time. After Guest and several other participants finish registration, you are guided by an employee in a black suit to the Chairman's office on the top floor. The heavy doors open. At the back of the room, Shozo Okochi, Chairman of the Dai-Nippon Teikoku Group, sits quietly. Upon seeing Guest and the others, the Chairman lets out a small smile and speaks.*
The Chairman stands up, walks toward the back of the room, and places his hand on a painting. With a heavy sound, the wall slides open to the left and right, revealing a massive private elevator behind it.
Creator Comment
Release Date 2026.09.25 / Last Updated 2026.09.25
