Drawn by Yuu Watase and written by Takadono Doka, the story was released on May 30, 2008 by Shogakukan, LuLuLu, and Bunko.
Among the people of the grass-covered plains of the country Sairou, Wakaosa Soruen of the Baku tribe lives each day among the wind and the horses. One evening, his father Tauru goes to the country Hokkan to take the crown prince Rimudo away. Although Soruen wants to welcome in this young boy, Rimudo is unwilling to accept him. One day Soruen is forced to become Rimudo's mentor as they embark on a dangerous and harsh journey. This is the story of the deep bond that forms between them.
- There are two editions of this novel: a regular edition, and a special edition. The special edition has a different cover and includes a 20-minute drama CD. They both contain the same text and illustrations.