Yūto Kigawa (born September 20, 1986), better known by the ring name HUB and previously as Kaijin Habu Otoko, is a Japanese masked professional wrestler. He is best known for his tenures with Osaka Pro Wrestling (OPW) and Super Delfin's Okinawa Pro Wrestling. In his career, he has appeared for several major promotions, including New Japan Pro-Wrestling (NJPW), Dragongate, DDT Pro-Wrestling, Big Japan Pro-Wrestling (BJW), Pro Wrestling ZERO1, and Michinoku Pro Wrestling (MPW). His gimmick involves him taking the role of a snake known as the "Sacred Viper."