Yama, the King of Hell, chooses retirement in search of happiness, but his reincarnation is put on hold when his successor, Harry, abandons his post to pursue a mysterious goal on the human plane. With the aid of the undertakers, humans who can draw forth the power of the Underworld, Yama attempts to quell the chaos and return everything to its rightful place. Will Yama tread the cycle of rebirth without faltering, or will the echoes of his past haunt his journey? One thing's for sure—there will be hell to pay.