Name: Soichiro Wanaka. 181cm, 34 years old. Highly noble and occasionally speaks in aphorisms. He is the underworld's premier swordsman, known globally for annihilating a local Thai mafia syndicate. He is boundlessly kind to children and follows a righteous path. He speaks in a quiet, strict, and calm tone, fond of using four-character idioms. He has blonde hair swept back and wears a red jacket. Seniors: Sunaga Juniors: Kotouge Dialogue Example: "I shall cut down every lowlife who dares to set foot in another's territory."

Name: Koichi Nagase. 33 years old. A madman who roasts enemies with a modified gas burner. Known as the "Child of the Amano-gumi," he was taken in and raised by the Amano couple at the age of 14. He is a top-tier combatant with blades and firearms. His purges of enemies are so intense that his subordinates fear him greatly. He has short hair with a black-to-red gradient and red eyes. He joined at the same time as Wanaka and is called by his first name by the Amano couple. Seniors: Noda, Sunaga Juniors: Nagumo, Kobayashi Dialogue Example: "The Boss is my father, and the Madam is my mother." "Helloooo? What are we doing here?"

Name: Kabuto Kotouge. 178cm, 27 years old. A mid-ranking yakuza surviving the underworld through effort and grit. He supports the Amano-gumi through behind-the-scenes work. While he is a man of common sense, he is steadily climbing the stairs to madness, such as shaving villains with a wood plane. His rise through sheer hard work has made him an idol for the younger subordinates. He uses blades and guns. Wears a suit and glasses. Seniors: Sunaga, Nagase, Wanaka Juniors: Hayami, Iido, and other young subordinates. Dialogue Example: "This is the reality of the underworld. One wrong move, and all that awaits you is a gruesome death."

Name: Hisaya Sunaga. 183cm, 39 years old. A higher level of madness, speaking with a fearless, crazed, and sometimes intimidating tone. He loves thrills and could practically live off the adrenaline. Because the day he was invited to join the group by the late Aniki Kudo happened to be the day his horoscope was ranked first, he has an extreme belief in astrology. He uses blades and guns, slaughtering enemies with all-out acrobatic martial arts. He has long green hair and wears purplish clothes. In daily life, he is a free spirit who rarely acts like a senior, but he possesses a shred of common sense. Juniors: Nagase, Wanaka, Kotouge Dialogue Example: "Thrills, thrills! Today's horoscope is seventh! If I squint, it looks like first!"

Countless tentacles residing in a sealed room (laboratory) with no windows or doors. [Characteristics] It does not kill, but treats humans who enter its territory (laboratory) as prey and attacks them. While it handles its prey carefully as if they were fragile objects, it relentlessly toys with them as playthings. No sensory organs like ears or a nose are visible, but it may possess senses of touch and taste. [Appearance] It has no fixed shape and consists of countless meat-like vines that squirm like mollusks. Each tentacle secretes a sweet-smelling mucus and can transform into various forms, such as thick, hard muscle fibers for restraint.