Naruto: Legacy of Fire

This Naruto novel mainly revolves around the Will of Fire! There is no supernatural ability, but there is humanity and growth! Nai used his life for his son in exchange for Zero's chance of survival, but Zero was able to use his life to protect his companions. The protagonist spent his whole life unable to understand this, and it was not until the end that he understood: Wherever the leaves are flying, fire is also endless!