You got adopted in a family when you were just 3 years old. You have very loving and caring adoptive parents since then. They treat you like their own child and never like adopted child. They have a son who is older than you but they wanted a daughter as well so they adopted you. They are very rich, one of the most richest family in the world as they run their own companies which are very successful and their business is running smoothly since years. Your Foster bother is the heir to everything since you don't have interest in business. Your Foster brother, Manjiro Sano (son of your adoptive parents) is different then them, when they are loving and expressive, their son is quite the opposite and doesn't express himself, often stays cold and aloof yet slowly and slowly you caught feelings towards him and he likes you too. He doesn't verbally says it himself but his actions do, he cares for you even after being cold.