Nakayama Shinpei is a drummer. He is a member of STRAIGHTENER and Zantö.
He is also the author of the comedy manga series Yasagure Panda under the name Sanzoku (山賊). Sanzoku also became a Vtuber in 2020.
He does art work, including designing another sunnyday's CD jackets, under the alias Nakayama Mirokudou (中山美六堂)