The story takes place after the wandering warrior Leina's championship has ended. The royal court's magician Alicia uses black magic and opens a doorway to another dimension. From that door, a rabbit lures Alicia into another dimension called Melfairland. Melfairland is holding a tournament of its own to award out a Queen's Blade, and Alicia enters the tournament in order to find a way to return to her own world. (Source: ANN)

Mo Fan is presumed dead. Nonetheless, hearing rumors about his whereabouts, Mo Fan's childhood friend Zhang Xiaohou sets out to find him. Upon reuniting, Mo Fan enlists Zhang Xiaohou and Li Man to kill a giant lizard whose soul will help him recover from the side effects of his devil powers. Human once more, Mo Fan spends time with his stepsister Ye Xinxia in Song City, where he witnesses a giant snake towering over the buildings. When Mo Fan asks his teacher Tang Yue about the snake, she takes him to her island home and shares her history with the beast. Mo Fan agrees to help her protect the snake in exchange for its valuable shed skin. Meanwhile, the White Eagle demon attacks the Western fortress and a plague spreads from Bai City to Song City. As blame falls on the giant snake, Mo Fan is fully determined to prove its innocence by searching for the true source of the disease as well as an antidote.

The fourth season takes place after the Mechanical City has collapsed and the Mohists are almost eliminated. The Qin Empire plans for a period of peace and prosperity and the Emperor utilizes a huge amount of labor to build the Great Wall and plans more sophisticated programs. There is apprehension in the city about the function of the giant boat Mirage which appears off the coast. Various rebel factions came together in Shanghai to defeat the Emperor's ambition. The Emperor and his forces, including the Quicksand group, the Yin-Yang School, Net Trap Organization and swordsman Shengqi are all arraigned against the rebel group comprising the Mohists, Confucianists and the Taoists. Tianming's education and training continue as he is faced with more and more challenges as leader of the Mohists. (Source: Qin's Moon Wiki)