Am I really the daughter of a thieves family? Hana Mikumo, daughter of the "L family", a family of thieves, unexpectedly falls in love with Kazuma Sakuraba, the son of a family of police officers. She spends her days dreaming of a normal life whilst hiding her true identity. Eventually her true identity is revealed to Kazuma, and after overcoming many difficulties, the two accept their fate and get married. Along with their new daughter Anzu, they manage to live happily, despite the problems that arise between their two families. Then one day, Hana's father announces his plan to retire from thievery after an incident. To make up for all the trouble he has caused Hana and Kazuma in the past, he offers them a late honeymoon trip. However, the trip actually turns out to be the last job of the "L Family", who are in search of the biggest treasure in history, and it becomes a grand adventure that reveals a family secret that even Hana does not know...

The story centers around millionaire Daisuke Kambe, the heir to one of the wealthiest families in Japan, who is assigned as a detective to the Modern Crime Prevention Task Force (aka MCPTF), at the Tokyo Metropolitan Police Department. Taking full advantage of his vast family wealth, he spares no expense in solving complex crimes, and has the tendency to evaluate everything including individual human lives in terms of their monetary value. Haru Kato, a detective with a compassionate heart who believes that money isn’t everything, is chosen as Kambe’s partner but is repulsed by his materialistic attitude. Having diametrically opposing personalities, witness how the two join forces to tackle seemingly unsolvable crimes and mysteries!

Hana comes from a family that has been thieves for generations. Hana refuses to become a thief and she wants to live a normal life. She currently works as a librarian and she is dating Kazuma, who works as a public officer. She hears that Kazuma's family are all public officers. One day, Hana visits Kazuma's family. She discovers that Kazuma's family, including Kazuma, are actually all police officers. Hana gets involved in a case and falls into trouble.

Taira Kei has a talent for contemporary dance since he was young and went to study in Germany to join a dance company in his teens. He has won several international competitions and was referred to as a “prodigy”. However, he encountered a setback in the middle and got frustrated. He returned to Tokyo and takes a part-time work while he tries to re-capture his dream. Nishihara Yui is a Chemisty teacher in her 30s, working at a prestigious high school. Even while continuing a love affair with a married colleague, she was still lonely until she meets Kei and gets swallowed in passion.