The wealthy Keigo and Yugo are twin brothers. Contrary to the serious Keigo, Yugo had a bohemian personality. After playing at the park, Keigo decides to return home but Yugo chooses to stay. He never thought Yugo would be kidnapped. Twenty years later, Katsuragi Keigo, now 30 years old, is a detective. The kidnapping of his brother, Yugo, remains unsolved and the investigation was discontinued. Meanwhile, Keigo's father Eiichi calls into a tv program hoping for information about the kidnapping. He offers a significant amount, 100 million yen, in exchange for information. Eiichi and Keigo both believe Yugo is still alive and his body has never been found. An attempted murder case occurs. Tajima, an unemployed man with information about the case 20 years ago, was stabbed. The DNA analysis reveals a surprising fact.