Taken from Justmanga:

From horror manga artist Senno Knife, comes a tale of love and death, demons and gods. Dark Dimension Zero is a tale of young Zero, a half devil-half god who has been given the duty of coming to claim the souls of the living once their time has come. In this first tale, Zero comes for a young girl, who has plunged off the side of a building going after the most precious posession in her life, a book. Can love guide her back to the realm of the living, or will this trip into eternity be permanent? In the second story we learn about Zero's past. His mother, who is imprisoned in a crystal in the Demon Realm, breaks free in order to save Zero from a ritual that will turn him completely to the dark world. But in saving Zero, she leaves herself open to recapture, and young Zero must leave without his beautiful mother. In the third tale, Zero has found a young man, who refuses to let go of his previous life because of a woman he loved. Demons come to tempt the young man in order to attack Zero, and a fierce battle ensues. Will Zero prevail? Or will the young man become lost to the Demon Realm forever? In the fourth and final story, Zero's half sister, Lucia, has come to the human world and has taken the life energy of a young boy in return for granting a man the health of his daughter. Can Zero free the boy and destroy the evil plan that Lucia has in store? Find out in this beautiful mix of romance, horror and magic.