[DeepL Translation - needs review] Volume 1 Introduction: The central branch of the Karasu Bank, an ordinary bank anywhere in the world. One day, Akira Mitarai, a rookie bank employee, is taken by his boss, Usami Zenimaru, of an unfamiliar department called the Special Operations Department, and steps into the bank's basement. There, he finds a "gambling hall" run by the bank. Mitarai is captivated by the mysterious gambler Maketsuchen's fights, and he cannot forget the blood-curdling battle...
