Summary
Oscar Joaquin serves as the grandfather and adoptive father of Yasutora Sado. Following the tragic death of Chad’s biological parents, the young man relocated to Mexico with Oscar Joaquin, who raised him with a gentle demeanor despite the old man’s formidable physical strength. Chad affectionately addresses him as Abuelo. During his formative years in Mexico, Chad was prone to extreme violence, using his size advantage to bully and assault other children. Although Oscar Joaquin attempted to instill gentleness in him, his efforts initially failed. The turning point arrived when the fathers of the children Chad had tormented launched an attack to punish him. Oscar Joaquin intervened, absorbing the punishment without retaliating, a selfless act that deeply inspired Chad to reform his behavior. Following this incident, Oscar Joaquin gifted Chad a Mexican coin minted between 1823 and 1909. This artifact bears the inscription "Republica Mexicana" along with the Mexican National Emblem, distinguishing it from later 1905 monetary reforms that used "Estados Unidos Mexicanos." Years later, after Oscar Joaquin passed away, Chad honored his grandfather’s teachings by vowing never to fight unless necessary to protect others, even at the cost of his own life. The coin became a tangible symbol of this promise, which Chad now values above his own existence. Upon the death of his Abuelo, Chad ultimately decided to return to Japan.
