Sand Land is a mysterious world where demons and humans eke out an existence in a barren desert wasteland. In hopes of replenishing their water supply, Fiend Prince Beelzebub, a demon named Thief, and a human named Sheriff Rao team up and embark on a journey in search of the Legendary Spring.

In a far future, war has destroyed the entire Earth, leaving only a barren wasteland where the supply of water is controlled by a greedy king.

Set in a future world. Japan has created a great medical technology that controls ethics, health, and social interaction to create a perfect world. Three young girls attempt to stand up to this by committing suicide, but it doesn't work. Years later, Tuan, one of the girls who attempted suicide must prevent a crisis that threatens this "perfect" world.

Within the shadows of Japan, a covert battle wages on. Around 200,000 ninjas still exist carrying out deadly missions as a secret organization, National Intelligence of NINJA, or NIN. But a challenger arises: UNDER NINJA. Known as UN, these ninjas oppose NIN at every turn. One such UN is Kuro, a high school loner sent to the front lines. What will be his fate and which faction will prevail?