Ryutaro Nakahara (Japanese: 中原 龍太郎, Hepburn: Nakahara Ryūtarō) born October 1, 1979, better known by his stage name Ryu☆, is a Japanese record producer, DJ, musician and arranger.
In 2000, Ryu, along with kors k won a contest started by Konami, in which composers were to make music such that the winners would get their songs in the next Beatmania IIDX installment.
Ryu's entry "Starmine" and kors k's "Clione" won the contest and both songs were featured in Beatmania IIDX 4th Style.
Since then, Ryu has become a mainstay composer for Konami's Bemani series as well as a freelance musician.
He has numerous works outside of Konami as well, including "Orion" from HARDCORE TANO*C's "HARDCORE SYNDROME 2" album[2] and remixes of "Caramelldansen" and "Caipirinha".