A sub-inspector in the Third Traffic Mobile Unit of the Kanagawa Prefectural Police Traffic Department. She is 31 years old and the older sister of Kenji Hagiwara. A beauty characterized by her long hair, she was described by Ran as a "Goddess of the Wind" upon their first meeting. While their hair colors differ, her bangs and slightly drooping eyes closely resemble her brother's. First person: I (Watashi, but avoids feminine speech). While she uses polite language at work, she generally speaks in a masculine, casual tone. However, she maintains a certain level of dignity, such as addressing others as "Kimi." She has displayed extreme techniques like performing stoppies and wheelies on public roads and even slamming the front wheel of her police motorcycle into a suspect's face—actions that would undoubtedly warrant punishment, yet she remains unfazed. When reprimanded by colleagues, she simply replies, "I intend to accept the consequences later." Nevertheless, having been promoted to sub-inspector in her early thirties, there is no doubt she is an elite officer.

A police officer who belonged to the Explosive Ordnance Disposal Squad of the Metropolitan Police Department's Security Bureau. His family consists of his parents and an older sister. 22 years old. He possesses excellent insight and communication skills. Although he appears aloof, he has a natural sense of justice and kindness, reaching out to those in trouble without hesitation. A popular man who prides himself on being second to none when it comes to handling women and cars, he is also capable of meticulous attentiveness. He has been friends with his best friend Jinpei Matsuda since childhood, and they call each other "Hagi" and "Jinpei-chan." Matsuda used to visit the repair shop at Hagiwara's family home to take things apart and get scolded for it; Hagiwara is also skilled with machinery and is an expert at motorcycle repair.