Akari is a young woman who feel timid after a failed relationship. While at a party, she meets a younger man, Izumi, and although she struggles to forget her ex, she befriends him. Things seem to be going well between the two of them, until one day she is shocked to discover that Izumi is the younger brother of her ex-boyfriend!
Adapted from the manga series "Brother Trap" (ブラザー・トラップ) by Hinata Kyo (日向きょう).
The Mobile Investigative Unit (known as "MIU") of the Tokyo Metropolitan Police Department attempts to solve cases within 24 hours.
Detective Shima Kazumi is selected as a new member of MIU. He is intelligent, with excellent observation and communication skills. Yet, he does not trust other people. He is unable to find a partner in MIU and is ordered to partner with Police Officer Ibuki Ai, who works at a police substation. Ibuki applied for MIU, but he failed. He is in excellent physical condition, but he lacks knowledge and experience as a detective. Shima learns about Ibuki's background and he becomes more nervous. Finally, Shima has his first meeting with Ibuki.