Ryuichi Yue is the firstborn son to Clan Leader Hiroshi Yue and his wife Chiaki, his younger brother being Asurieru Yue by twelve years. He was raised as the future Yue Clan Leader and was taught discipline and honor, amongst other things. He was also trained as a samurai and upholds his duty and honor moreso anything else. 

When the news of Prince Luis Buchanan's death reached his family, Hiroshi sent Ryuichi to Buch del Santo to retrieve Asurieru where he would be charged for his crimes and "dishonor" to the family.