The series follows Mutsu Tsukumo a young martial artist in his pursuit of perfection. He takes on more and more challenges and stronger and stronger opponents as the story progresses. His martial art is one handed down through the generations called quotMutsu Enmeiryuuquot which he proudly boasts that in over 1000 years has not been defeated even once. It is a perfect combination of strikes joint locks throws groundfighting techniques and special quothissatsu wazaquot onehit kill techniques. Source Tapanime.