Ruka (Blood Type O) (formerly Luinspear) is the current drummer of Nightmare. After the first drummer of Nightmare, Zannin left for unknown reasons, he joined as a support member as first, but shortly after became the permanent drummer of Nightmare. He was born on June 9, 1979 in Setagaya, Japan. His real name is Satoru Karino. His favorite colors are Black and Purple. He was influenced by BOOWY/Blue Hearts/Lind Berg.
The LEGENDARY SIX NINEEditOn December 31, 2009, Ruka created his new side project, The Legendary Six Nine to express his own voice in music. The members consist of Ruka on drums, TWIGY a hip-hop artist on vocals, Hakuei from Penicillin on vocals, Ni~ya from Nightmare on bass, Shinobu from Creature Creature on guitar, and Takayama on guitar.
Their first single, CRUEL consisting of 3 tracks, was released on March 24, 2010.