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...
'cause he lost to you in that 
middle school karate match.
porque lo venciste en la 
competencia de karate.
porque perdió contra ti en ese combate de 
karate entre estudiantes de secundaria.
porque perdeu para você numa 
partida de caratê na escola.