A professor that investigates and studies accidents.

Manako Amano is a professor in the engineering department of a top university. She currently researches the act of failure. The study is to determine direct reasons and social factors for failure and how to avoid having the same end result. Her research related to failure, leads her to various other fields like corporate corruption and medical malpractice. Using her research on failure, she solves mysteries involving various accidents.

Manako Amano is a professor of engineering at a leading university, and has been studying "failure studies". Rather than pursuing the responsibility for failure, she studies for prevention and recurrence by investigating the direct causes; the background of the incident and the social causes. The various accidents that occur every day are always have a root in failure somewhere, and accident investigation is the best fieldwork of Manako. Due to her incredible curiosity, her activities go beyond engineering and delve into such things as corporate fraud and medical accidents. Her personality is selfish, and she moves at her own pace. She loves failure with the belief that "growth and progress will always be accompanied by failure". She continually frustrates the other party in order to shine her eyes on the failure story. Despite that, she is a genius with a built-in failure database of east and west in her brain. Manako reaches the truth of the accident every day.