The protagonist, a high school girl who visited China for a school trip, accidentally falls into the Yangtze River. She nearly suffocates in the water and blacks out. When she wakes up, she finds herself in A.D. 209, the age of Later Han. Who saved her was the mysterious frivolous-looking turtle. The turtle, introducing himself as the mystical creature indwelling in 'He shi bi' (The Jade disk of 'He'), suggests her that he would send her back home if she finds a proper person to be the master of 'He Shi bi'.

The age of turbulence rampant with arms and tactics, a girl's adventure for love and survival now here begins!

Based on China's famous history "Records of the Three Kingdoms" by Chen Shou.