I Became the First Prince: Legend of Sword's Song

Story:

Legend of Sword's Song: I was reincarnated as a sword and lived for hundreds of years, spending my entire existence cleaning up after others. Then, out of nowhere, I ended up taking over the body of the fifteen-year-old First Prince—a notorious good-for-nothing. “How many do you think I’ve raised?" The great knight once called invincible, the Dragon Slayer who brought down the Mad Dragon, the Mercenary King… I raised every last one of them. The magic sword Gruhorn, possessing the body of the rogue First Prince… this is the myth he begins to write anew. [By the Author that brought you ] and [By the Studio that brought you }