Nearly 2000 years ago, the prosperous Han Dynasty of China collapsed. Heroes rose and fell, and three nations emerged—Wei, Shu, and Wu. Historians refer to this period as the Three Kingdoms period. The romance of the three kingdoms is an intriguing tale of heroic deeds, of alliance forged and broken, of loyalty and betrayal.

There exists the Cosmos Warriors, a team tasked with the duty of protecting freedom, justice, and peace of the universe. When the Master of the Cosmos Warriors was killed onboard a traveling spaceship and the rest of the passengers were kidnapped by the sinister Green People, Captain Leo soon uncovers a malicious plan that would put the fate of the people of Earth on the balance.

When "ordinary boy" Kagami Kazuya meets the beautiful tsukumogami Kiriha, his life gets turned upside-down. As a "Taboo Child" who draws the supernatural towards him, he receives orders from the God of the Land, Kukuri, to become an exorcist and defeat these evil forces. And so, he and Kiriha do battle. To find out information on these supernatural beings, Kazuya and his friends set up a counselor's club at school. But behind the typical-seeming troubles he hears about, he uncovers a major plot to target Kukuri... In addition to the sadistic-yet-beautiful tsukumogami Kiriha, the situation draws other girls to Kazuya to join the fray!