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Natsumi is an officer stationed at the fictional Bokuto Station in Tokyo's Sumida Ward. She is very outgoing as well as very laid back. She often demonstrates superhuman strength second only to Shoji Tokairin and is a motorcycle enthusiast, capable of high-risk maneuvers on both bikes and mopeds. Natsumi has a prodigious appetite for food and alcohol, and has been known to show up at work with a hangover. She is also a chronic late sleeper. Despite having many bad habits, she is a very capable police officer and does her job seriously when needed.

She keeps a mini-moped, a Honda Moto-Compo (JR-2) in Miyuki's Honda Today squad car and uses it when a flanking strategy is required. It is prominently labeled "NATUMI" (in the Nihon-shiki transliteration system) before her first day at Bokuto in the beginning of the first anime, later re-coloured and re-labeled "POLICE" in the later appearances and on the Bandai Model kit of the Honda Today. When off-duty, she operates a Yamaha RZV motorbike until it is damaged beyond repair during later part of the first season. She is subsequently tricked into buying a Subaru R2, which is in a near-non-functioning state.