Synopsis
Michiru Kita has a unique ability: she can see a "ring of death" around people's necks, and the darker the ring, the closer they are to dying. One day, she notices that two classmates, Chika Akatsuki and Shito Tachibana, have rings that are completely black. When she tries to warn them, she discovers their secret—they are already dead, but they remain alive thanks to a contract with Zombie-Loan, a mysterious loan agency. However, nothing is free: the boys must hunt and eliminate zombies to repay their debt. Once they learn about Michiru's "Shinigami Eyes," they pull her into their dangerous world.