The Kojiki, and this episode, tells the story of Yamato Takeru, an imperial prince who struggled to distinguish himself from his countless siblings and ended up becoming a legendary hero in the process.
Incidentally, the phrase "peel back layers" 
means to find out the truth.
Por cierto, "negi oshiesatosu"
significa convencer a alguien de algo.
Aliás, "tirar alguém do casulo" é quando
se tira alguém de seu reclusamento.