Tenchi wo Kurau

Liu Bei is a descendent of Liu Sheng, prince Jing of Zhongshan of the Han Dynasty. Cao Cao is the adopted grandchild of Cao Teng, a eunuch in the palace. Sun Jian is the governor of Jiangdong. The three show their marvelous leading-role to divide China to three states: Shu, Wei and Wu.

Liu Bei meets a beautiful giant heavenly being in heaven, and she gives him the power to conquer the country. He meets and swears to be brothers with Guan Yu and Zhang Fei.

(Source: Wikipedia)