A dying mob boss entrusts Lupin with a diamond that supposedly is the key to a vast treasure. But when Lupin is attacked by an assassin and saves a mysterious girl from trouble, it becomes clear that that there's more to this treasure then meets the eye... 

(Source: ANN)

During the An Lushan Rebellion of the Tang Dynasty, monsters are everywhere and the people were destitute in the Central Plains. Li Haobai started from the Bashu and wanted to go to the front line to make a meritorious deed. On the way he was swallowed by the monster. By coincidence, Li Haobai and the guardian of the dragon’s veins merged with each other to obtain the power of the black dragon. And he has since been involved in the struggle of various forces.

Two years ago, the world was saved by Dan Bashin and the other light bearers of the cores. Having once risked his life in Grand Rolo's strife, Dan no longer finds passion in the mundanity of everyday card battles. When Dan desires to clash against stronger opponents, he is approached by Mai Shinomiya. She offers to bring him to the future, the stage of a new conflict where Dan's strength is needed. The two arrive in the year 2650, where civilization has been ravaged by the struggle for power between mankind and an otherworldly race known as "Mazoku." As humanity begins to crumble under the dominance of the Mazoku, the hardened light bearers are destined to cross paths once more. Armed with new cards from the future, Dan and the other warriors must yet again bear the fate of humanity on their shoulders. [Written by MAL Rewrite]

Momo is the princess of Fenarinarsa, a land of dreams that is getting further and further from Earth. She is sent to help the Earth regain faith in its dreams. To assist her are her friends Sindbook, Mocha, and Pipiru and her magic wand that transforms her into an adult. She's ready and willing to help anyone she can in order to make their dream come true, no matter what happens.