Anzai Takashi (Koichi Iwaki), the leader of the Anzai-gumi, enjoys poker at the Kishochokai’s underground casino. Meanwhile, a heated poker duel unfolds between female gambler Himiko (Sayaka Tsuruta) and university student Kota Katori (Shota Haruta). Kota loses, wiping out ¥2 million. Tokunaga (Masami Tate), a half-gangster, schemes to clear his ¥5 million debt by using Kota in a rigged game but gets caught, increasing his debt to ¥7 million. The next day, Tokunaga disappears, leaving Kota to shoulder the debt. Desperate, Kota’s girlfriend, Anna (Mari Yamaji), returns to her family home and explains the situation to her mother, Reiko. Seeking help, Reiko turns to her husband, who is none other than Kawabe Akira (Yoshiyuki Yamaguchi), the Anzai-gumi’s second-in-command.
Anzai-gumi boss, Anzai Takashi (Koichi Iwaki), visits a jazz club run by corporate affiliate Shin-kai Yuji (Hitoshi Ozawa) to hear pianist Namura Miyako’s (Ako) performance. Miyako, who had been supported by Anzai since her youth, harbors deep feelings for him. One day, Mishima (Masaki Nishimori) from the Nakahama-gumi visits the club with a woman and becomes infatuated with Miyako, aggressively pursuing her. Despite her initial reluctance, Miyako gradually falls for Mishima. Soon after, her behavior becomes increasingly strange. Sensing something amiss, Anzai orders his men to investigate Miyako’s actions, leading to unexpected revelations...
Hiratsuka Heihachi is loud and impolite, but always smiles. He is a strange detective. Unlike Hiratsuka, Saionji Kosuke is the heir of a wealthy family. He is full of justice, naive and honest almost to a fault. Saionji Kosuke is then designated to the #1 investigation team, which he has always admired. Unfortunately, his job is to watch over Hiratsuka Heihachi. Up to this point, Hiratsuka Heihachi has been the sole member of his team, but he manages to solve all of his cases one by one. Other detectives are curious about his methods, some even think he may have some mystic powers. This is the primary reason why Saionji is tasked to watch over Hiratsuka. The real reason Hiratsuka is able to solve so many cases is that the criminals hate Hiratsuka the most ...