Reiko, a pampered college student, is busy every day with piano lessons and dates with her boyfriend. She's engaged to Katsuo, a tax accountant, and is overflowing with happiness, but tragedy strikes suddenly. Her father is criminally charged with tax evasion! He's taken away, and their assets are seized. Reiko, a sheltered girl who can't do anything on her own, remembers hearing that her classmate Shingo makes money playing pachinko, so she decides to try her luck there. However, her funds quickly run out, leaving Reiko at a loss. But then, by chance, Shingo shows up at the parlor. After hearing Reiko's story, Shingo promises to train her into a skilled pachinko player. Reiko's pachinko skills improve rapidly, but she becomes entangled in a dark conspiracy involving the pachinko parlor, a corrupt tax accountant, and even the public prosecutor's office. Will Reiko, the pachinko player, awaken her true potential?!