It is about a teenager called Recca who was from Civil War Period, claims himself to be a ninja, and fights using the same weapons and techniques. He swore that whoever manages to defeat him, he will become their ninja/slave. But his whole life took a different course when he meets Yanagi Sakoshita...who becomes his hime(princess)
Everything went peaceful until he meets his half brother, Kurei who was also from Civil War Period.
