In the underworld, a rumor circulates. There is a genius surgeon called Dr Chocolate that always succeeds regardless of the surgery. The conditions for performing surgery are 100 million yen in cash ($745,350.90) and chocolates. In fact, Dr Chocolate is a 10 year old girl with genius surgical skills joined by a mysterious doctor called Teacher with a prosthetic hand and a team called the Chocolate Company. They save patients in special situations no matter the circumstances.