The Hyena Has Seven Lives.

Haie Nao is a private detective who specializes in inheritance cases. He runs his own office, Haie Inheritance Investigation Office. He once worked as an elite lawyer, but due to a certain reason, he was kicked out of the lawyers' association. He is also a coffee otaku. When he thinks, he likes to munch on plain coffee beans. He also hates the phrase, "Dead men tell no tales."

Haie Nao takes on challenging inheritance cases and uses his high intelligence and the help of people with colorful personalities. While respecting the will of the deceased, Haie Nao tries to solve the family conflicts and the hidden truths within the inheritance.