A period piece, Jūshin Enbu features Taitou, a young man who hates the empire that rules at the time, with his sister Laila as they learn of a mysterious power Taitou holds, unbeknown st to him. Taitou is the incarnation of a mysterious star that grants him a huge amount of power that he has yet to fully master. Joining them is Ryuukou, who has power similar to Taitou, just more honed.

After Taitou`s coming of age ceremony, which required him being beaten by Ryuukou, he is given the Kenkaranpu, described as a conqueror`s sword, which Taitou is not even capable of drawing. Soon after, he and Laila are greeted by a man named Shimei, who wanted to take the sword. After a quick exchange of blows, Shimei explains the source of Taitou`s power, the star Hagun, one of the most powerful Hokushin-Tenkun. When Shimei uses his own sword`s power to cause Laila to stop breathing, Taitou becomes so angry he releases Hagun`s power, draws Kenkaranpu and pins Shimei to the wall by throwing the sword through his stomach. He then turns to Ryuukou and attacks.

Despite his best efforts, Ryuukou could not overcome Hagun`s power. It was only a resuscitated Laila`s intervention (along with a nasty head butt) that brought Taitou to his senses. However, they all soon learn that Shimei had escaped with the sword.

At midnight, Taitou sneaks out to recover the sword. As he is leaving Ryuukou and Laila quickly join him on his journey.