Zombie Loan

This is my current obsession. It was actually one of the few who gave me enough interest to move on to the manga after the anime was finished.

Summary:
Michiru Kita is a special girl who possesses Shinigami Eyes, a power which allows her to see a person's nearness to their destined death by seeing a ring, invisible to normal people, around the person's neck. When a person is marked to die, a gray ring appears, which darkens over time. Once the ring turns completely black, the person dies. Chika Akatsuki and Shito Tachibana, two boys in her class, both have black rings around their necks, but to her surprise, they are not yet dead. It is revealed that after a tragic accident that was supposed to kill them both, the two boys made a deal with a secret loan office called the Zombie-Loan. In return for keeping them alive, the two have to hunt zombies for the loan office. When Michiru gets involved with them, she finds that her life has just become more complicated.
(credits to Wikipedia)

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In a weird way, this anime made me realize how quick you can die, and that you should value the time that you are living.