Became the Lout First Prince

He was reincarnated as a sword and lived for hundreds of years, playing second fiddle to others throughout his life. Then, suddenly, a 15-year-old bastard took over the body of the first prince. “How many children have I raised?” A great knight called invincible, a dragon slayer who defeated a bright dragon, a mercenary king, etc. I raised them all. The demonic sword Gruhon, who possessed the body of the 1st Prince of Maniacs, A new myth he is writing.