Takako Mamiya is a lawyer who quits her job at a prestigious law firm and establishes her own office. She confidently sets out to build her business, but soon her former firm is putting up obstacles and interfering, causing Takako's employees and clients to drift away. She finally puts together a new staff consisting of a college student who knows little about the law, a girl who applied for the job in hopes of meeting a rich guy, a hard-nosed lawyer, and a paralegal who hasn't passed the bar exam yet.

Takako reluctantly handles divorce cases with her incompetent crew. For an elite lawyer like her, divorce cases are the most boring and unrewarding cases that exist. Through clashing with her employees and clients, Takako soon becomes a very mature and tough lawyer.

"Divorce Lawyer" also tells the story of how difficult it is to judge love and relationships in legal terms.