In a time when the great war between five rival races for supremacy on Earth ended with humanity's victory led by the hero Sid, the world suddenly gets "overwritten" right before the eyes of a boy named Kai. In this rewritten world, Kai witnesses humanity's defeat in the war as a result of Sid's absence—where dragons and demons now rule the land, and Kai himself has become a forgotten existence to all humans. However, after encountering the mysterious girl Rinne, Kai resolves to break free from this rewritten fate. In a world without a hero, he inherits the sword and martial skills of the hero (Sid) and challenges the powerful enemy races that dominate the land.

The moon and the earth are linked by a single contact point, "Mitsuru ga Sakichau Ouren Rakuniushi" where Tatsuya lives under the supervision of the Sphere Kingdom (Moon Kingdom)'s Princess Feena Fam Earthlight who is coming to stay at his home.

Alice Sakaguchi once dreamt that she is another person living on the moon. The dream is so strange and so real that Alice can't stop thinking about it. She finds out that some of her classmates are having the same kind of dream. They soon discover that they had been seeing flashes of their past lives as a team of scientists on the moon. Alice and her friends then decide to find the other members and piece together what took place back then. Complications arise when they realize that everything that happened in their previous existence continue to haunt and affect their present lives.