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...
That's why I wanna be a person 
who helps other people, too."
"Por eso, quiero ser una persona que 
ayude a otras personas en el futuro."
Por eso quiero ser alguien de 
ayuda para los demás, también."
Por isso eu também quero ser uma
 pessoa que ajuda os outros".