Officer Mai Kawai has had enough! She’s sick of being a police officer—but just when she’s about to hand in her resignation, the arrival of a brilliant (and beautiful) ace detective named Seiko Fuji changes her mind. Will Fuji reignite Mai’s passion for policing? And will Mai uncover the mystery of why Fuji was transferred to this ordinary police box?

The girls in a high school literature club do a little icebreaker to get to know each other: answering the question, "What's one thing you want to do before you die?" One of the girls blurts out, "Sex." Little do they know, the whirlwind unleashed by that word pushes each of these girls, with different backgrounds and personalities, onto their own clumsy, funny, painful, and emotional paths toward adulthood.