"Elite" members of an insurance company are gathered together to form a unit to investigate an accident and whether the company needs to pay out on the insurance policy or not.

A man is murdered after stealing documents from the Olympic Department of the Ministry of Education, Culture, Sports, Science and Technology.

Insurance firm “special investigations” (the Marutoku unit) tackles a tangled case sparked by a drunk-driving crash, probing family ties and hidden motives to determine what compensation, if any, should be paid.

The Marutoku unit reopens a controversial past accident while probing a fresh insurance claim. As links emerge between victims and insiders, chief MINEKO Ōga and rookie IPPEI chase the truth behind staged crashes and fraud.