Kōsei

is a nomad who is an exceptional that rose in the deserts of the. Through his expertise and knowledge, he has immediately risen to the ranks of, and one that only answers to the. With the help of his self-proclaimed 's journals, ironically belonging to his missing father, Kosei's skills have progressed to a level where he has developed his own mending techniques.

Even with the aforementioned, Kōsei travels the world to obtain more knowledge and acquire samples of different ambients (and its inhabitants). During that, he offers help to the weak, the ill and the wounded while educating those that wish to "better" their lives. Because of these efforts, people across the world revere him as the. However, the nomad has a lovely and beautiful maiden accompanying him, who decided to become his guardian in his journey: Kasumi.