On Bossun's 15th birthday, he finds out the truth about his parents. Unable to cope with the tragedy, he lashes out, only to meet the child his father once saved when he was a kid, all grown up, who gives him a letter...
Even if someone betrays you, 
never betray anyone yourself.
"Aunque te traicionen, 
no traiciones a nadie."
Incluso si alguien os traiciona, 
nunca traicionéis vosotros a alguien.
Mesmo que alguém te traia,
 nunca traia ninguém.