Konoha: the Ninjutsu I Copied Can Be Upgraded

The third ninja world war is coming! Jiang Feng is a member of the ordinary ninja class. He can only reach the level of chunin in his life. He is destined to be a cannon fodder sent by Konoha to the third war. But... The system is awakened! Jiang Feng can not only copy anyone's ninjutsu, but also upgrade the copied ninjutsu. When Jiang Feng upgraded the copied ninjutsu, the entire ninja world was shocked! Obito: You call the fire escape that dries up rivers the great fire ball jutsu? Kakashi: You moved the moon to a different space with just one look. Do you call this Kamui? Namikaze Minato: Are there any zombies that can be used like this? When we use the corpse seal, we are tributes to the God of Death. What do you mean by treating the God of Death as your younger brother? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.