Renji Yanagi (柳 蓮二, Yanagi Renji) is a 3rd year regular at Rikkai Daigaku Fuzoku and is known as one of the Three Demons (Sannin Bakemono) along with Captain Yukimura Seiichi and Vice-Captain Sanada Genichiro. He is a childhood friend and doubles partner of Inui Sadaharu, from Seigaku. He is known as the Data Master.