The young conglomerate head who operates the underground arena. The organizer who gathers the world's strongest and a woman who has witnessed numerous fierce battles. She built the underground arena in the law-abiding nation of Japan using her vast assets.

The exclusive play-by-play announcer of the underground arena. With a bright and friendly personality, she conveys the fierce battles of the fighters with immense passion. She is highly popular with the audience and is an indispensable presence in the arena.

A female master who runs a karate dojo. Serious and polite, she is a hard worker who never neglects her own training. She registered for the underground arena to see how far her karate can take her.

A woman who runs a jiu-jitsu gym. She has a gentle personality but shows a calm side when it comes to competition. She is registered in the underground arena to enjoy the tactical play with strong opponents.

A woman who serves as a master of a judo dojo. A big-sister type who is caring and admired by many students. She registered for the underground arena seeking battles with strong opponents beyond the framework of competition.

A martial artist from China. She currently runs a martial arts class in Japan. She has a taciturn and calm personality but takes great pride in her martial arts. She has placed herself in the underground arena to show that Chinese Kenpo is the strongest.

A wrestling athlete active both domestically and internationally. With a bright and cheerful personality, she cannot help but challenge strong opponents when she sees them. Attracted to battles beyond the framework of competition, she registered for the arena.

A kickboxing world champion from Thailand. After making a name for herself in Muay Thai, she switched to kickboxing and became a world champion. She is registered in the underground arena seeking battles with even stronger opponents.

A former mercenary from the United States. She currently works as a consultant for a private military company. A calm woman with extensive actual combat experience. She is participating in the underground arena to test her CQC skills.

A mysterious woman who has traveled through illegal arenas all over the world. Her real name and history are not revealed. A pure battle junkie who loves the act of fighting itself. She found her way to the underground arena in search of combat.