Private detective Reiji Akiba has a theory about those awkward moments and weird coincidences we all encounter in life. They are actually encounters with the dead; it's their way of sending us a message. But you may not want to open such strange mail from beyond—not unless you can see the ghostly attachment like Akiba can, and not unless you carry a gun that can kill what isn't alive like Akiba's aptly named Kagutsuchi—the tool between God and earth—digging a divine grave to lay to rest the evil dead. (Source: Dark Horse Comics)

Mail was initially serialized in Ace Next, but moved to Shounen Ace when the magazine went defunct. The series was published in English by Dark Horse from December 6, 2006 to March 14, 2007. The same company later published the series digitally from January 25, 2012 to April 4, 2012.