To get back the lost brooch that his deceased grandfather had made for his grandmother, Yuto starts his life as a thief. One day, he sets off the alarm to a building he's prowling, and while trying to escape from the roof in a panic, Yuto accidentally trips and almost falls to his death! Luckily, he is saved with not a moment to spare by the policeman Hiroki, who agrees to let Yuto go if he becomes an informant for the police+