Origin
Kusagakure
Ryūzetsu belonged to the Grass Fruit Group of Kusagakure and was childhood friends with Mui's son, Muku. As children, they both dreamed of resurrecting the glory of Kusagakure.
Naruto
Moments prior to Naruto Uzumaki's birth, a huge demon known as the Kyuubi, the Nine-Tailed Fox, attacked Konohagakure, the Hidden Leaf Village, and wreaked havoc. In order to put an end to the Kyuubi's rampage, the leader of the village, the Fourth Hokage, sacrificed his life and sealed the monstrous beast inside the newborn Naruto.
