A Nagoya native and the daughter of a local butcher, Imagawa was encouraged by her family to practice Kyūdō from a young age. This long range weapon marked her entry in martial arts by perfecting her assessment of multiple factors a once while carrying precise, controlled, and fluid motions. Imagawa traveled the world to perfect her skills and technique. She later attended the National Police Academy and gained the nickname of "Hibana" due to her improvised explosive devices and brilliant leadership skills on the field. Fluent in seven languages and lethal with any weapon, Imagawa was recruited by the Aichi Police Department Special Assault Team. Her diverse techniques and charisma resulted in her to moving quickly up the ranks.



She became specialized in paramilitary techniques gained by training with the SAS, FBI SWAT, and GIGN, to name a few. From her diverse training, she acquired a rare tactical versatility, which includes a proficiency in tubular (bus, train, and airplane) assaults. In 2016, Hibana accepted an invitation to join Rainbow. She later began a secret relationship with Jack "Pulse" Estrada. During the 2020 Tournament of Champions, Imagawa landed a killing shot on Pulse that lead to her team's victory.