Kaori is an unconditional City Hunter. Her fantasy is to live great adventures alongside her idol, Ryo Saeba. But, single at 40 and prisoner of a boring job, she begins to lose her youthful illusions... Her dreadful daily life turns around the day when, hit by a train at full speed, she wakes up in the skin of a high school girl in the Shinjuku of the 80s! Disoriented and with all the nerves, she tries to do everything for the whole and traces the famous XYZ on the sign of the station...