Naoki Satoya has been Ryuunosuke Oohara"s closest companion and confidant through thick and thin since childhood, even though most classmates dread the influential Oohara yakuza family. Just months before Ryu is slated to assume his father"s role, he announces a desire to become a train driver and lead a tranquil life alongside Naoki. Determined not to let their heritage die, the Oohara clan enlists Naoki to coax Ryu back. Yet when Ryu rejects even his best friend"s heartfelt pleas, Naoki suspects a hidden motive behind the refusal and wonders what secret forces shape his choice in ways they cannot foresee, and keep him.