Isto é Empréstimo de zumbi.
Michiru Kita possesses the Shinigami Eyes, a power which allows her to see a person's closeness to death by seeing a ring around the person's neck. When a person is marked to die, a gray ring appears, which darkens over time. Once the ring turns pitch black, the person dies. Chika Akatsuki and Shito Tachibana, two boys in her class, both have black rings around their necks, but are still alive. It is revealed that after an accident that was supposed to kill them both, the two made a deal with Zombie-Loan. In return for keeping them alive, the two have to hunt zombies to pay back their debt.