Keishi Sokan Asami

Asami is a beautiful cop in the Investigative Precint 1! Her dream is to solve a big case! But because of Asami hating Lieutenant Shimoyama's interference Asami's chances are thwarted time and time again. One day, an all-points bulletin stating a discovery of a floating corpse!? Shimoyama claims it's a suicide but Asami does not rule out foul play and starts investigating with her partner, Harada. A front line police story depicting the adventures of a female cop! With sex!
From Baka-Updates Manga