Ryo Matsuri (祭遼, Matsuri Ryō) is a Japanese professional wrestler, better known under the ring name Onryo (怨霊, Onryō). As Onryo, Matsui portrays the character of a ghost wrestler, who was killed after winning a cursed championship. He is best known for his work in Frontier Martial-Arts Wrestling and Big Japan Pro Wrestling. He is the founder of the 666 promotion.