Mikoto Misumi is a pathologist at UDI (Unnatural Death Investigation) Lab. She believes there must be a truth behind the deaths and can't endure neglecting deaths that are unnatural. Associates who utilize her are recorder Rokuro Kube autopsy doctor Kai Nakado , clinical evaluation technologist Yuko Shoji and UDI manager Yasuo Kamikura. They try to show the truth and work with death cases.