Since his childhood, Kiomaru has been formed by master Sadamitsu of the Gassan forge so that he could later become a specialist in sword making. One day, when he learns of the brutal death of a young man to which he sold his first sword, he realize his own inexperience and decides to adopt a new attitude by following an exacting training. After avenging the young man, he continues his training, but one day, his master reveal to him an unbelievable secret: 18 years ago, meteorites nicknamed "Steel of the stars" fell from the sky on a dark mountain. Since that day, it seems the wheel of destiny enforced itself.

(Source: MangaUpdates)