Yukihira Natsumi is a female cop who sees her job as holy. She knows she must finsh any case properly and bring justice. But even Yuhihira has made a mistake in her career, she killed one of her suspects some years ago, It's one of the reasons people don't manage to like her. The second one is Yukihira herself; she hates group work. And so, now she has a new case to solve.