Writer Misuzu Nakahara confesses her involvement in the 300 Million Yen Affair, a sensational 1960s bank robbery. In the chaotic days of the 1960s, Misuzu, a lonely high school girl from a troubled family, finds sanctuary with her nihilistic brother, Ryo, and his friends. They pass their days hanging around a shadowy jazz cafe bar, indulging themselves in a life of sex, drugs and alcohol. Social unrest simmers, while their relationships gradually falter. Misuzu gets drawn into a dangerous plot against society that was hatched by one of the rebellious youths, Kishi; they will rob a bank car of 300 million yen! The two accomplices set out for numerous rehearsals, while in their hearts they secretly and quietly become even closer. Then one rainy day, aided by coincidence, they pull off their heist successfully, which has a huge impact throughout Japan. However, it brings Misuzu only a great sense of loss and sadness, which she had never anticipated...