The series takes place in a school of the Eldora Kingdom. Princes, kings and princesses from all over the world are sent to Eldora King's High School to polish their skills and knowledge. It is a top-notch school for only the best in the royal family.

In enters Yamato - a poor student who was "wrongly" admitted to the school. Yamato used to live with his grandfather as his parents passed away when he was young. As he was having a dispute with the school over the mistake, Reddo - the King of Eldora - walks in and convinces both Yamato and the school that the "mistake" doesn't matter. It was later revealed that apparently it wasn't a "mistake". Reddo was the one who enters Yamato into the school as they used to be childhood friends.

Reddo became quick friends with Yamato who wonders why the King is acting friendly with him. Unlike all the other students from the royal bloodline, Yamato is an orphan with no money and he feels out of place at times. However he soon finds happiness and life in the school... with Reddo and his classmates. Join in Yamato and Reddo's high school journey through joy and tears.