A story that follows the lives of four female friends in their 30's as they become involved in a series of murders.

Meet Savi, a successful career woman working toward the next phase in her life—both professional and personal—simultaneously bucking for partner at her law firm while she and her husband, Harry, try to start a family of their own. Savi's free-spirited and capricious baby sister, Josselyn, couldn't be more different—living single, serial dating and partying, and regularly leaning on her big sister along the way. Their common best friend, April, a recent widow and mother of two, is rebuilding her life after tragedy and learning to move forward, with the support and guidance of her closest girlfriends. And friend Karen, a successful therapist with her own practice, reconnects with the girls after her involvement in a complicated relationship with a patient goes far too deep.

Follows the lives of four female friends and their involvement in an array of marital and extramarital relationships.

Shibasaki Kaori is a doctor. Her patient that she was having an affair with dies. Kaori is suspicious of the patient's son Kido Takashi about the death. Noguchi Tomomi is a single mother. She is excited in experiencing love for the first time in 7 years. Harada Saeko is in conflict with her husband Harada Satoshi about having a child. Mizushima Juri insists on having freewheeling romance. She feels excitement with meeting a woman.

These four women's lives connect and an unexpected story begins.