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The story begins with Kotori Monou (who has an old childhood friend, Kamui) having a dream that she was in the classroom listening to her teacher talking about a story, until a girl in her class drops her pen and Kotori picks it up and gives it to the girl. Then Kotori 's teacher asks Kotori to read a passage in the story!! She reads for a minute or two and sees Kamui outside, walking to the school with a smile on his face!! Suddenly, Kotori awakens and realizes it was just a dream. She finds herself trying to get dressed and get ready for school as Fuma, her older brother, waits for her on his bike.

Kotori recalls her memories with Kamui as children, wondering why he has changed. Meanwhile, Kamui deals with people trying to attack him. While Kamui tries to recover from an injury, a Dragon of Heaven, Sorata, and a Dragon of Earth, Yuto, confront each other in hopes of meeting Kamui.

Kamui recovers under Fuma's and Sorata's care, but when Sorata questions Kamui's motivations for returning to Tokyo, he is quickly rejected by Kamui. Meanwhile, the Dragons of Earth begin researching to see if Kamui is the 'one'. Kamui encounters Fuma where they recall the pledge they made in the past. Their time is interrupted when the Divine Sword is stolen from the Togakushi Shrine.