In 2009, Narumi Yamato is a 3rd-grade high school student in Nagasaki, Japan. Yamato and his friend Odagiri Miku find an old man, Shoji Akira, stabbed and lying in the street. The old man tells Yamato that his father is the criminal involved in the 300 million yen case. That night, Yamato's father, Tetsuya disappears and 3 days later his body is found drowned in Tokyo. Yamato and Miku find themselves caught in a whirlwind centered around the still unsolved stolen 300 million yen case from 1968.