In Shinjuku Kabukichou, the largest red-light district in Japan, reside two individuals with a tenuous grasp on reality. Despite his timid and feeble demeanor, Ichi transforms into a ruthless warrior, utilizing his exceptional martial arts skills and concealed blade to swiftly demolish his opponents when driven to tears. On the other hand, the yakuza boss Kakihara, exhausted with his own existence and the people surrounding him, discovers comfort in inflicting self-damage and severe injury on others, deriving a sense of vitality from the excruciating pain he endures. These two fierce men have been engaged in a long-standing rivalry that endures to this day.
