Not to be confused with the unrelated artist Ryuu.
- Name: Ryutaro Nakahara (中原龍太郎)
- Birthday: October 1st, 1979
- Blood Type: O
- Birthplace: Fukuoka
- Likes: Visual design, arts, cartoon/anime, movies, video games, baseball, Japanese sake
- Dislikes: Persistence
Ryutaro Nakahara, better known as Ryu☆, first appeared in beatmania IIDX 4th style after winning a musicianship trial along with kors k, sanctioned by KONAMI for beatmania IIDX. He is currently one of the most active artists in BEMANI, having at least one new song for each new game on every active BEMANI series except for MÚSECA and ノスタルジア.
Ryu☆ is one of the artists in EXIT TUNES (he's an Executive Director). Many of his recent works for BEMANI are licensed by EXIT TUNES. Outside of BEMANI and EXIT TUNES, Ryu☆ regularly appears in the HARDCORE SYNDROME (HARDCORE TANO*C) series of albums and in various S2TB Recording releases.
Ryutaro is known for being one of the most prominent figures in Japanese hardcore, dabbling into every hardcore genre, even speedcore. He's also proficient on dance music like bubblegum dance, handz up and lately, EDM and dubstep.
- Ryutaro's primary alias, Ryu☆, is pronounced as "Ryusei" (sei/星 being "star" in Japanese).
- Ryutaro has provided a couple of works for TAITO's sound team, ZUNTATA.
- Ryu / Ryu☆ / Ryu*
- HHH (member of, with Dai and VJ Halka)
- 青龍 / 雷龍 / 紅龍 / 黒龍 / 白龍 / 機龍 / 星龍 / 月龍 / 電龍
- Vandalusia改 (member of, with Jun Wakita)
- Auridy (member of, with Dai.)
- Cream puff (member of, with moimoi and VJ Halka)
- Levaslater (member of, with Starving Trancer)
- Another Infinity (member of, with Starving Trancer)
- The 4th (member of, with kors k)
- starmine (2009)
- AGEHA (2010)
- Rainbow☆Rainbow (2011)
- Sakura Luminance (2012)
- Plan 8 (2013)
- BLUE DRAGON (2013, as 青龍)
- We're so Happy (2014)
- Seventh Heaven (2015)
- Ryu☆BEST -STARLiGHT- (2016)
- Ryu☆BEST -MOONLiGHT- (2016)
- AO-∞ (2017, as 青龍)
- Rainbow Drop / AI (2003)
- Fly Into Dream / Rise And Fall (2005)
- Genbu (2009)
- Age Of The Moon (2009)
- Green Lightning (2010)
- The 4th EP (2012, with kors k)
- AO - EP (2015)
- ShiRo - EP (2016)
- The 4th EP2 (2016, with kors k)
- AO-0 (2016, as 青龍)
- Donkey Donk EP (2017)
- Murasaki-EP (2017)