Do you know when you are going to die? Michiru Kita does, as she has the
ability to see a "ring of death" on the necks of those around her—and
the darker the ring, the closer one is to death.
One day, she notices that two boys in her class, Chika Akatsuki and
Shito Tachibana, have completely black rings. Seeking to warn them of
their impending demise, she stumbles onto their secret: they are already
dead, but are kept alive due to a contract with Zombie-Loan, a
mysterious loan office. Of course, nothing comes without a price, as the
boys must hunt down and kill zombies in order to pay off their debt.
And once they learn about Michiru's "Shinigami Eyes," they drag her into
their crazy world.