Michiru Kita has Shinigami Eyes that let her see a ring around the neck of anyone close to death, darkening as their end nears. When she notices pitch-black rings on two living classmates, Chika Akatsuki and Shito Tachibana, she learns the pair survived a fatal accident by borrowing their lives from an outfit called Zombie-Loan. To repay the debt they hunt down illegal zombies, and they pull Michiru in to use her sight to track their targets.