Tokyo Highway Patrolwomen Natsumi and Miyuki get off to a bad start when Miyuki busts Natsumi for reckless moped driving on her way to work. Things get worse when they find out they're going to be partners!

Running late on her first day as a patrol woman for the Bokuto Police Department, spunky moped rider Natsumi Tsujimoto decides to take several shortcuts, only to be chased down and cited by mechanical genius and expert police driver Miyuki Kobayakawa. Upon arrival at the precinct, Natsumi finds out that her new partner is the same woman who ticketed her earlier. At first, she doesn't trust Miyuki, but in a short period of time, they develop an unbreakable friendship that overcomes traffic accidents, reckless drivers and even the strongest typhoons to hit Tokyo.

Don't you want to meet with a woman who falls in love, likes to dress up, and arrests felonious offenses? What if she fights for outrageousness of the society with the sounds of the howling siren, and yet, enjoys her love life and friendship? This is how the 21st century-woman with strong will and gentleness would be like. And without doubt, attractive woman are to be surrounded by attractive guys.

Officers Tsujimoto and Kobayakawa are transferred back to Bokuto Police Station after stints in other police departments. Shortly after this, the discovery of smuggled firearms and the recovery of a magnetic disc herald new troubles for Bokuto station as the Chief is thrown in jail for keeping silent over "Bee Number One", developed by Detective Emoto who went missing two years ago.